remove popups from admin theme

I have an admin theme setup within this site (which is heavily styled and makes extensive use of popups API) and I need to remove popups from this theme.

I recall that there is a setting that will do this but I cannot seem to find it again. I had this set before but mistakenly removed it at some point.

Can someone please point me to this setting as the admin section is almost unusable now.

Thanks so much

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