Please post a description of your problem, if possibly in English. Just a picture makes us guess as to what exactly is your problem, and that doesn’t help.
I tried installing from the command line (
sudo flatpak install io.designer.GravitDesigner); maybe the OP’s issue was this:
6. [✗] io.designer.GravitDesigner stable i flathub 200.7 MB / 206.0 MB Error: While trying to apply extra data: apply_extra script failed, exit status 256 error: Failed to install io.designer.GravitDesigner: While trying to apply extra data: apply_extra script failed, exit status 256
Which looks like an upstream problem affecting the flatpak: