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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
As mentioned previously, it is a feature of the Pathfinder 1e system (which explains why disabling modules does not change the behavior). I don't use that system, but it looks like you can disable the behavior. If you like the idea but just don't want to have such a large image take over the screen, you could disable it in the System's settings, and intead use the module Hover Image which allows you to do the same thing but also choose how large the preview is, or to only have the preview when you also press a key while hovering. That's what I use.