Created attachment 205031 [details] Example to show the problem Open attached file. The master slides have a size of 28cm x 21cm. The third slide had been set a size of 30cm x 15cm directly on the slide. When this was initially done, it had generated an own master slide. Now I have change its master slide. It shows the background of the assigned master, but the size is not reset to that of the master. I have removed the generated master. But that has no effects on the slide. It still has size 30cm x 15cm. And - and that is the bug report here - there exists no way to bring the slide in a mode, that is uses the size of the master. Or to say it in a different way, the page properties dialog has no "Standard" button to remove direct formatting. All tested with a current build of master Version: 26.8.0.0.alpha0+ (X86_64) Build ID: eff4bc45f9834026acea227f7c3d0bd2bffd9af1 CPU threads: 32; OS: Windows 11 X86_64 (build 26100); UI render: Skia/Vulkan; VCL: win Locale: de-DE (de_DE); UI: en-US Calc: threaded