Hello @sonic2kk, as far as I know, this is the correct behavior. Steam is calling xdg-desktop-portal at which point your (or your desktop environment's) configured preference gets called. Unless there's an API handoff of a preferred title, this is outside of Steam's control.
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Please describe your issue in as much detail as possible:
Attempting to save community-posted screenshots from the Steam Client will open a portal window that allows you to save the screenshot to disk. However, the dialog does not have a meaningful title, it shows as "xdg-desktop-portal-kde". It should have some kind of title like "Save Image".
Steps for reproducing this issue: