Hi wpforo team,
I am facing an issue with text editor, all tools are working fine in normal mode but in full screen mode many features are not working (Font size, Text color, Insert/edit link, Spoiler and Emoji).
for more details: https://www.screencast.com/t/NUfetbImx
I've asked our developers and currently waiting for a response from them. I'll let you know once I get a response from them.
I have seen this issue with optimizers. It is a css issue, you need to exclude some css (from tinymce).