[BrandoElFollito]

The thing is that I still want BW to give me the possibility to choose a site to fill in (so I do need the popup). It is just that sometimes I need it out of the way, and there is no gesture for that (such as sliding it to the side for instance, or long pressing to make it go away)

[gian21391]

Are you referring to the popup created by the autofill service that is integrated in Android (https://developer.android.com/guide/topics/text/autofill)? In that case you can activate the inline autofill functionality (assuming that your keyboard supports that) so that no popup will show up.