Gear icon is not visible in manage form or display

Strange. Just tested on simplytest.me and it worked as screenshot →

Do you mind confirming that is the same icon, please?

Hi, thanks for reply.
Yes, it's the same icon. I tested it with another website with the same configuration. But the icon still does not appear. Then, if it is running on your system, I think it intersects with another module or setting in my admin configuration. I'll let you know when I find it.
By the way, I encounter the same problem when I use gin or claro as admin theme. But when I use Barrio custom subtheme(my default front-end theme) as the admin theme, the icon appears. I don't know if the setting(gear-icon) is visible because it is the frontend interface.

Probably is a conflict in the bootstrap library

Explanation

• When you put Modal to appear on /admin/* it loads BS automatically on admin pages
• If your Modal isn’t /admin/* it don’t load
• When don’t load it works
• So probably is a conflict

If you want to make sure:

1. Open Modal Global Settings
2. Mark the settings to “don’t load bootstrap automatically”
3. Save
4. Put Modal in /admin/*
5. Verify the gear icon

P.S. it isn’t the final fix, is just a test to confirm that is a conflict on BS library

If you already has BS library being loaded in other project your Modal can works even disabling this option

OK, It's about Bootstrap version.
There's no problem with Barrio because it uses Bootstrap5 (local or cdn)
But admin themes like Gin and Claro only worked with Bootstrap3 option. Check screenshot, please.
Thanks.