yes -> true

modules/backend/controllers/groups/config_list.yaml

@@ -8,7 +8,7 @@ modelClass: Backend\Models\UserGroup
 recordUrl: backend/groups/update/:id
 noRecordsMessage: backend::lang.list.no_records
 recordsPerPage: 5
-showCheckboxes: yes
+showCheckboxes: true
 
 toolbar:
     buttons: list_toolbar

modules/backend/controllers/users/config_list.yaml

@@ -8,7 +8,7 @@ modelClass: Backend\Models\User
 recordUrl: backend/users/update/:id
 noRecordsMessage: backend::lang.list.no_records
 recordsPerPage: 5
-showCheckboxes: yes
+showCheckboxes: true
 
 toolbar:
     buttons: list_toolbar

modules/backend/models/user/columns.yaml

@@ -5,20 +5,20 @@
 columns:
     login:
         label: backend::lang.user.login
-        searchable: yes
+        searchable: true
     first_name:
         label: backend::lang.user.first_name
-        searchable: yes
+        searchable: true
     last_name:
         label: backend::lang.user.last_name
-        searchable: yes
+        searchable: true
     full_name:
         label: backend::lang.user.full_name
         select: concat(first_name, ' ', last_name)
-        searchable: yes
+        searchable: true
     email:
         label: backend::lang.user.email
-        searchable: yes
+        searchable: true
     groups:
         label: backend::lang.user.groups
         relation: groups