If your Microsoft Edge can't highlight text in PDF documents in Windows 11/10, then this post shows how to fix the issue. Microsoft Edge lets you highlight PDFs in 5 colors.

Beyond its familiar interface, FlexiPDF is a feature-packed solution that justifies the ‘Adobe Acrobat Pro on steroids’ label ...

If you want to extract highlighted text from PDF file as a plain text file, then this post covers some good free PDF Highlight Extractor software to do that.