At the bottom of the window as you can see in the image only the top half of the theme is working the bottom of the theme should have round edges.

Curtains bottom frame can not be set as wide/thick as Windowblinds. The most, I think, you can have for the left, right and Bottom frame is 8 pixels only. So you need to design it to use that 8 pixels for that curve.

Thank you,

Basj,
Stardock Community Assistant

I can't change the setting its stuck at 0

And Make sure that option for "Allow Fat Borders" to Enable

Thank you,

Basj,
Stardock Community Assistant

Please look carefully at my screenshot in reply#4. 

Thanks

Basj

Stardock Community Assistant. 

Hello,

Can I see how your left, right and bottom frame look like. Or if possible send me your skin and let me have a look at it.

Thank you,

Basj,
Stardock Community Assistant

I only change those in the red box, refer to screenshot below, and that is what I get.

Thank you,

Basj,
Stardock Community Assistant

The one I edited was Big Sur day 2, yours was on Big Sur, maybe you can try delete both of that theme. Redownload it again from that link you gave me. Apply Big Sur Day 2 and do the Edit as I high lighted above. Click apply button and if it don't work than something else is not working.

Maybe try purge and reinstall Curtains as mentioned here : https://forums.stardock.com/500728/curtains-support-faq#CurtainsPurge Just make sure to re-download the latest version from your account. Reboot after the purged. Reinstall, and Reboot again after the installation. Retest it. Report back here.

Thank you,

Basj,
Stardock Community Assistant