Finder's Quick Look feature shows file previews, but it doesn't work for folders. Folder Preview finally adds that feature to ...

Or, if there's a file inside ... up files/folders in macOS, right-click them and select Compress Items from the menu to make ...

You should know one thing. If the checkbox shows a square inside, the Folder’s Properties, it means that some items inside are Hidden or Read only and some not. A blank checkbox indicates that ...