Sigil creates a file user_prefs.json in path C:\Users\<USER>\AppData\Roaming\sigil-ebook\sigil\QtWebEngine\Preview\ on every run.
New: HandBrake (Feb 20, 2026), Platform 30.2 (Feb 17, 2026)
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I can confirm this is an issue. If you open up the SigilPortable.ini file within SigilPortable\App\AppInfo\Launcher, adjust the DirectoriesMove entry as follows:
This should handle portablizing the additional settings.
Sometimes, the impossible can become possible, if you're awesome!
This is fixed in Sigil Portable 2.0.2 Rev 2.
Sometimes, the impossible can become possible, if you're awesome!