As an addendum to my last post, I'd better add a word of warning here.
It is possible that your system is set up in a way which keeps the OS and software installations on your C drive (to make backing up the system drive easier) with the saved documents, images, videos, downloads and all the rest stored on the F drive. If that is the case, you might find that some things don't work after you have deleted the contents of the F drive, or after the F drive and it's partition have been deleted.
For example, by default your documents folder will be on the same drive as the OS, but it can be moved to another drive instead. If that is the case and you then create a new document and try to save it, the folder won't be there any more so the saving won't work.
It's a long time since I needed to mess around with partition sizes, but I'm pretty sure that the Easus software can extend one partition and reduce the size of a second one by using free space in the second partition (the F drive in your case). That being so, there is probably no need to delete the F drive or the partition holding it.