Unfortunately, you cannot directly change mouse binding. However, there are other options to simplify opening the file in Solution Explorer.
Apart from double left-clicking the file to open the file for editing, there are several additional options to do that:
F7 shortcut to view the file.
CTRL + double left-clicking to force open the file.
Also, you can disable opening files to preview, so files will open with one left-click:
Tools>Options>Environment>Tabs and Windows.
Uncheck: Allow a new file to be opened in the preview tab.
However, if you still need to use double left-click binding to open the file, as the last solution, do one of these:
Reset keyboard mapping scheme: Tools>Options>Environment>Reset
Open Visual Studio Installer and click Repair.