Hi,
All of a sudden, all files and directories are highlighted in blue (see screencap). Did a search and found nothing. What happened?
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Looks like you selected everything (Ctrl-A) and jumped to the location bar (Ctrl-L). Hit Esc and a cursor key and you should be back to normal.
To me this looks like a wildcard label filter matching all files & folders * which is applying an user-specified color.
Check your Preferences / Favorites and Recent / Label Assignments or if there is nothing unusual there, it could be in the Preferences / Folders / Folder Formats (see Labels tab of each entry there).