Hi!
Please note that layout customization options vary per layout and some options are only available on specific layouts.
The options that are shown on your screenshot are available for slideshow layout in Editor X.
Try to check all tabs available there. Also, check this article where you may find useful information:
https://support.wix.com/en/article/editor-x-adding-and-customizing-the-pro-gallery
Please ping me if you have any further question or open a support ticket here .
Have a good day!