How to use FAVORITES tab?

Hi there.
I don’t know how to use FAVORITES tab as shown in the figure.
Can I use it?

I haven’t used MODEP (MOD Duo user), but assuming the feature is working, you can add a plugin to Favorites by viewing its description dialog and clicking the star icon.

Thank you for your reply!

I viewed the description page but I couldn’t find.
I used a debugger. Then I found that it was hidden.

I change the display property and I can add plugins to Favorites!