diff --git a/htdocs/projet/tasks/list.php b/htdocs/projet/tasks/list.php
index bfda3ad31be..25b9452518f 100644
--- a/htdocs/projet/tasks/list.php
+++ b/htdocs/projet/tasks/list.php
@@ -274,7 +274,7 @@ if ($search_task_user > 0) {
 
 
 $varpage = empty($contextpage) ? $_SERVER["PHP_SELF"] : $contextpage;
-$selectedfields = $form->multiSelectArrayWithCheckbox('selectedfields', $arrayfields, $varpage); // This also change content of $arrayfields
+$selectedfields = $form->multiSelectArrayWithCheckbox('selectedfields', $arrayfields, $varpage, getDolGlobalString('MAIN_CHECKBOX_LEFT_COLUMN', '')); // This also change content of $arrayfields
 
 
 $title = $langs->trans("Activities");
@@ -708,6 +708,13 @@ print '<table class="tagtable nobottomiftotal liste'.($moreforfilter ? " listwit
 // Fields title search
 // --------------------------------------------------------------------
 print '<tr class="liste_titre_filter">';
+// Action column
+if (!empty($conf->global->MAIN_CHECKBOX_LEFT_COLUMN)) {
+	print '<td class="liste_titre maxwidthsearch">';
+	$searchpicto = $form->showFilterButtons('left');
+	print $searchpicto;
+	print '</td>';
+}
 if (!empty($arrayfields['t.fk_task_parent']['checked'])) {
 	print '<td class="liste_titre">';
 	print '<input type="text" class="flat" name="search_task_ref_parent" value="'.dol_escape_htmltag($search_task_ref_parent).'" size="4">';
@@ -826,10 +833,12 @@ if (!empty($arrayfields['t.tms']['checked'])) {
 	print '</td>';
 }
 // Action column
-print '<td class="liste_titre maxwidthsearch">';
-$searchpicto = $form->showFilterButtons();
-print $searchpicto;
-print '</td>';
+if (empty($conf->global->MAIN_CHECKBOX_LEFT_COLUMN)) {
+	print '<td class="liste_titre maxwidthsearch">';
+	$searchpicto = $form->showFilterButtons();
+	print $searchpicto;
+	print '</td>';
+}
 print '</tr>'."\n";
 
 $totalarray = array(
@@ -854,6 +863,9 @@ $totalarray = array(
 // Fields title label
 // --------------------------------------------------------------------
 print '<tr class="liste_titre">';
+if (!empty($conf->global->MAIN_CHECKBOX_LEFT_COLUMN)) {
+	print_liste_field_titre($selectedfields, $_SERVER["PHP_SELF"], "", '', '', '', $sortfield, $sortorder, 'center maxwidthsearch ');
+}
 if (!empty($arrayfields['t.fk_task_parent']['checked'])) {
 	print_liste_field_titre($arrayfields['t.fk_task_parent']['label'], $_SERVER["PHP_SELF"], "t.fk_task_parent", "", $param, "", $sortfield, $sortorder);
 	$totalarray['nbfield']++;
@@ -946,7 +958,9 @@ if (!empty($arrayfields['t.tms']['checked'])) {
 	print_liste_field_titre($arrayfields['t.tms']['label'], $_SERVER["PHP_SELF"], "t.tms", "", $param, '', $sortfield, $sortorder, 'center nowrap ');
 	$totalarray['nbfield']++;
 }
-print_liste_field_titre($selectedfields, $_SERVER["PHP_SELF"], "", '', '', '', $sortfield, $sortorder, 'center maxwidthsearch ');
+if (empty($conf->global->MAIN_CHECKBOX_LEFT_COLUMN)) {
+	print_liste_field_titre($selectedfields, $_SERVER["PHP_SELF"], "", '', '', '', $sortfield, $sortorder, 'center maxwidthsearch ');
+}
 $totalarray['nbfield']++;
 print '</tr>'."\n";
 
@@ -1008,6 +1022,18 @@ while ($i < $imaxinloop) {
 		if ($userAccess >= 0) {
 			print '<tr data-rowid="'.$object->id.'" class="oddeven">';
 
+			// Action column
+			if (!empty($conf->global->MAIN_CHECKBOX_LEFT_COLUMN)) {
+				print '<td class="nowrap center">';
+				if ($massactionbutton || $massaction) {   // If we are in select mode (massactionbutton defined) or if we have already selected and sent an action ($massaction) defined
+					$selected = 0;
+					if (in_array($object->id, $arrayofselected)) {
+						$selected = 1;
+					}
+					print '<input id="cb'.$object->id.'" class="flat checkforselect" type="checkbox" name="toselect[]" value="'.$object->id.'"'.($selected ? ' checked="checked"' : '').'>';
+				}
+				print '</td>';
+			}
 			// Ref Parent
 			if (!empty($arrayfields['t.fk_task_parent']['checked'])) {
 				print '<td class="nowraponall">';
@@ -1318,15 +1344,17 @@ while ($i < $imaxinloop) {
 				print '<td class="right">'.$projectstatic->getLibStatut(5).'</td>';
 			}*/
 			// Action column
-			print '<td class="nowrap center">';
-			if ($massactionbutton || $massaction) {   // If we are in select mode (massactionbutton defined) or if we have already selected and sent an action ($massaction) defined
-				$selected = 0;
-				if (in_array($object->id, $arrayofselected)) {
-					$selected = 1;
+			if (empty($conf->global->MAIN_CHECKBOX_LEFT_COLUMN)) {
+				print '<td class="nowrap center">';
+				if ($massactionbutton || $massaction) {   // If we are in select mode (massactionbutton defined) or if we have already selected and sent an action ($massaction) defined
+					$selected = 0;
+					if (in_array($object->id, $arrayofselected)) {
+						$selected = 1;
+					}
+					print '<input id="cb'.$object->id.'" class="flat checkforselect" type="checkbox" name="toselect[]" value="'.$object->id.'"'.($selected ? ' checked="checked"' : '').'>';
 				}
-				print '<input id="cb'.$object->id.'" class="flat checkforselect" type="checkbox" name="toselect[]" value="'.$object->id.'"'.($selected ? ' checked="checked"' : '').'>';
+				print '</td>';
 			}
-			print '</td>';
 			if (!$i) {
 				$totalarray['nbfield']++;
 			}