update

app/Http/Controllers/Admin/OtherController.php

@@ -233,8 +233,8 @@ class OtherController extends CommonController
         $calendar = Calendar::where(function ($query) use ($start_date, $end_date) {
             $query->whereBetween('start_time', [$start_date, $end_date])
                 ->orWhereBetween('end_time', [$start_date, $end_date]);
-        })->where(function ($query) use ($start_date, $courses) {
+        })->where(function ($query) use ($courses) {
-            if ($start_date != CourseType::START_DATE) {
+            if (request('course_type_id')) {
                 $query->whereIn('course_id', $courses->pluck('id'));
             }
         });