Those big files you share are surely the ones responsible for taking your Google Drive account to the limit.
A blue line will indicate how close you are to reaching the 15GB limit.
As you scroll down, the files will only get smaller and smaller.
To the right of the file, youll see how that specific file is.
Near the dots, youll also find the option to add acommentif you end up keeping the document.
To remove more than one file, you wont see checkboxes; that would have been nice.
you could also press CTRL or Command and choose the file individually.
Once they are selected, right-click and either download them or erase them.
Google Drive wont automatically give you more space by erasing the files.
you should probably permanently erase the files to make more space.
There, youll see all the files you erased.
To erase them all permanently, hit the empty trash option at the top right.
Youll see a confirmation message about deleting those files.
punch theDelete Foreveroption to go through with it.
But if you only want to erase one, choose that file and then on the Empty Trash option.
Only after doing this will you see that you have more storage available.