Studio does only only show 2 subpanels for opportunity

I can only modify 2 modules as subpanels in studio for Opportunities, while there are many more subpanels.
I don’t know when this changed, but I could modify all of the subpanels in an earlier stage.

Please assist what might be the cause.

Jaap

Ensure the others are enabled in Admin -> Display Modules and Subpanels.

Thanks,

Will.