The size of the Snapshot text is being set to the Zoom level set in Options > Editing > Options.
Steps to reproduce.
- Open Beta 27.
- Set Options > Editing > Options > Main Text Editors Zoom to 300. (Zoom for Document Notes and Bookmark Preview remain at the default 100)
- Click OK until Options window is closed.
- Restart Beta 27.
- Open Scrivener 3 Tutorial.
- Select any document in the Binder.
- Take a Snapshot.
- Click on the Snapshot. It will be displayed at Zoom 300.
- Set Options > Editing > Options > Main Text Editors Zoom to 150, leaving others at 100.
- Click OK until Options window is closed.
- Restart Beta 27.
- Open Scrivener 3 Tutorial.
- Find the snapshot you took in step 7 and click on it. It will be displayed at Zoom 150.
Since I always work at Zoom 150, it makes the Snapshot pane rather less useful, since I have to do a lot of scrolling to check anything out.
Also, the width of the margins on either side of the Snapshot text are based on what is in Options > Appearance > Main Editor > Editor Margins, which also restricts the visible text in this pane.