I set the editor as default but it doesn’t work.

When I write an article no button appears, no functionality

If I try to change Default Profile for all users in the layout you don’t see the buttons. I leave a screenshot.

I tried to uninstall and install JCE again but to no avail.

Usage:
Joomla 4
TZPortfolio component

Have you tried a different toolbar theme?
https://www.joomlacontenteditor.net/support/faq/editor/classic-toolbar-theme

Thanks Hardys,
I changed the toolbar theme and now it works.

Thanks Ryan too you.
I’m not using any javascript and css compression.

Regards