it seems that the Windows operating system shortcuts are in conflict with the Eclipse shortcut keys.
There really is a conflict in taking this shortcut. I use Eclipse and I have some colleagues who also use tried and asked to try to reproduce the error, and we did not have the same problem. Maybe it’s related to your eclipse.
Make sure your Eclipse window is maximized and selected.
Solution 1: You may be trying to change your shortcuts in Eclipse via the General > Keys menu.
Search for the shortcut that is already set as default, in case Ctrl+Shift+F is related to indentation and change to another key sequence.
At this link you can find in the session Customizing Key bindings how to perform the customization with more details.
Solution 2: Update Eclipse, and/or reinstall your Eclipse.
Eclipse is not Shift+TAB to indent the selected code?
– Pbras