Calc opens large window

Mostly use Calc, but this appears to happen in all docs.
Have a large screen (3440x 1440), and Libreoffice always seems to open, taking up about 3/4 of the screen. I always shrink it down to <half, but next time - same again! Very annoying!
Running Opensuse Tumbleweed/Plasma, and realise I can control it through the DM, but don’t want to do that.
Is there an easy way?

OS: Tumbleweed latest ; screen size 3440x1440 ; Libreoffice, 252.2.5.2 (X86_64)

Thanks.