To remove the create course button you will need to remove the instructor's edit post capability so you will need to use any plugin to edit user role capability then remove edit posts capability for instructor . Then this administrador tab will also get removed.
and for other tabs I'll provide you custom code or custom css code.
After you are done with the above steps of removing edit post capability of instructor then you can add this code in wplms-customize.php to hide marked tabs
Goto plugin editor>> wplms-customizer>>wplms-customizer.php