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The sidebar header names the panel you are in, the Mac window drops its duplicate app menu button, and search is faster on the desktop and finds the pages under an archived page or Space. The full list is on the changelog.
Opening the app for the first time. This build is not yet signed or notarized. On macOS, open it once, then go to System Settings → Privacy & Security and click Open Anyway next to Ubimate. On Windows, if SmartScreen warns, click More info, then Run anyway. Details are on the download page.
Updating from v26.10.5. Download and install this version over the old one. Your content and settings are kept.