Replace font in Find and Replace is disabled

Hello Everybody, I'm having a weird issue in Adobe Animate CC. The replace font options is disabled and I don't know why.

I've tried looking for an unable option but I couldn't find it, and it worked fine yesterday, and I didn't touch anything yesterday.
The account that I am using is being used on another computer, but that should be fine, as it can be used on two computers at the same time, and on the other computer it works normally.
I've reinstalled it, I shut down everything, and it couldn't make it work, I looked everywhere online, and nothing...
Help me, por favor!