@ottereli: You’ll have to edit a small typo in code. Go to gridilicious_theme_folder/inc/customizer_includes/ and open gridalicious-customizer-featured-content-setting.php
go to line 139 and change the existing code:
'sanitize_callback' => 'wp_kese_post',
to
'sanitize_callback' => 'wp_kses_post',
Note: Line number may vary with theme version. If so, search for wp_kese_post
in that very file and replace with wp_kses_post
Then you’ll be good to go and change it via customizer.
Thank you for helping us finding the issue.
Regards,
Mahesh