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I've not used this in particular, but assuming it's the one at https://github.com/zadam/trilium/ then in its source control it has an images directory and that particular image seems to be icon-grey.png. Presumably if you replace that file it will use your version, so I'd look where it's installed and see if there's an images/ directory with that (and other) files in it.
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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.
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Hence, a higher number means a more popular project.