When you have two or more Writer processes running, if you have two Writer windows showing two documents with different Paragraph Styles and you have enabled "Styles" tool bar (F11), you will see the current Styles of the active Writer window in the Styles preview panel. Every time you switch from one Writer window to the other, bot Styles preview changes simultaneously, showing in both the selected Writer window styles.
You must have the two Writer processes (with two distinct documents with distinct styles) showed side by side in your screen, showing in both Writer windows the "Paragraph styles" side panel.
I can't confirm it with Version: 7.2.0.0.alpha0+ (x64) / LibreOffice Community Build ID: 807d059d99e7b99fe45a712428befa17ffa44858 CPU threads: 4; OS: Windows 10.0 Build 19042; UI render: Skia/Raster; VCL: win Locale: de-DE (de_DE); UI: en-GB Calc: CL
How are you running them? Separate versions with separate user profiles? Sharing a user profile? Could you attach a video capture of how it behaves?
It seems it's fixed (at least in Linux version) so I'll close this bug if I can do it.
(In reply to rafael.linux.user from comment #4) > It seems it's fixed (at least in Linux version) so I'll close this bug if I > can do it. Thank you for retesting. Please use status RESOLVED WORKSFORME in such a case.