How can I organize desktop screenshots on iMac?

What macOS version?

The Screenshot App has an option for telling it WHERE your screenshots go without your having to manually move them. See this:

Take screenshots or screen recordings on Mac - Apple Support

Note the image near the top. The "Options..." button lets you create a folder for screenies and place it wherever you wish. Doing that has saved me a lot of time.

Screenshots can be treated like any other file or folder that is on your desktop.

In the menu strip at the top of your desktop,

• Do View > Sort by > None

then

• Do View > Clean Up. Don't do "Clean Up By ..."
• Then move the screenshots & any other files or folders where you want to place them on your desktop.

I hate having screenshots, icons and other junk plastered on my desktop.

What I do is put the screenshots that I want to save into a Folder named Screenshots and trash the rest.

Tell me what you are trying to accomplish.

• From your first question it appeared you wanted to arrange things on your desktop.
• Now it sounds more like you want to get information about a particular screenshot file.