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The Fields and Text block, when switched to HTML mode, features a code editor based on Codemirror. The editor appears broken when the GeneratePress theme is active.
The GeneratePress theme injects styles that break the Codemirror styling.
As a workaround the following PHP snippet (which you can add at Toolset > Settings > Custom Code) will add inline style rules to the document head to override the GeneratePress styles and revert to the normal Codemirror style rules.
Check this link for details of the sample code: https://pastebin.com/VGgZ2A1f
Looking forward to get that implemented in a next update since I’m a heavy GeneratePress + Toolset user.