By default three instructors are shown in a row. Example :
To change the number of instructors shown in one column from 3 to 4 (or any other) follow below steps :
1. Make sure you've WPLMS Child theme installed and active.
2. Copy the All instructors temaplate from the parent wplms theme which is wp-content/themes/wplms/allinstructors.php file and paste it in the child theme. This will force wordpress to load the child theme template instead of the parent one, so you can update the theme without any worries in future.
3. Now edit this file in the child theme via WP Admin -> Editor or via text editor which can be uploaded via FTP.
4. Locate this line of code :
<div class="col-md-4 col-sm-4 clear3">
5. Change it to :
for 4 instructors per column
<div class="col-md-3 col-sm-3 clear4">
for 2 instructors per column
<div class="col-md-6 col-sm-6 clear2">