Newly installed french door frame feels flimsy

guitarless

I just got a french door installed at the rear of my house replacing a sliding door. The doors themselves seem solid in the frame, but if I put a bit of force against the frame there's a little bit of give. I can see a hairline crack in the plaster from doing this. I feel like if I gave a very solid push or kick to the frame itself it would pop out. I asked the installers about it before they left and they said the frame is just screwed into the wall which is how they're normally installed.

What's the standard way of installing french doors? Is it expected that there is some give in the frame when installed? If they're normally just screwed in what's stopping people from forcing the frame itself instead of the door or the glass?

Screws + expanding foam is normal i think. The frame screws are fairly thick, you wouldn't be kicking them out in a hurry.

If they skipped the expanding foam, the frame could still move a fair bit, even if there's no chance of it coming out. There was a serious difference in the big windows in my house before after i put expanding foam around the frames.

Not really an issue for security though- not like the glass would be hard to break anyway, but probably the door was put in from the outside, so even if it could be kicked loose you'd need to push it from the inside...after you'd already broken in.