Préférences non modifiables ultérieurement

During my daily use of Ps, a pop-up just came asking me if I’d like to dismiss dynamic preview while Manual Transformation on a Dynamic Object with Dynamic Effects to optimize performances.
I miss-clicked and accepted, which led me into not being able to foresee what my layers will look like from now on while I manually transform them.

I thought it was ok and I’d just reset that option that isn’t suitable neither useful for my use of Ps and therefore went into the Settings panel.
I went through literally every single item listed in every single folder of the Settings panel and nothing matched this option and could help.

I then decided to completely reset Ps settings, closed it and re-opened it ; it wouldn’t work again.

I had to uninstall the software and erase any user preferences to reinstall it and recreate my Workspaces to make it work like it did 2 days ago…

EDIT : 

I created a new document with a simple square and a shadow cast effect, worked fine.

I re-opened my documents, tried to modify my Dynamic Object, got the popup again.

And now, if I create a new document with the same square and the same shadow effect the Cmd T won’t let me preview the result like it did 10 minutes ago...