kdialog from home:krop:Qt6:Release:kde_rebuild project
Select Your Operating System
Add repository and install manually
For Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:krop:Qt6:Release:kde_rebuild/Tumbleweed/home:krop:Qt6:Release:kde_rebuild.repo zypper refresh zypper install kdialog