How To Move Files to Folders/Collections in Google Docs
Step 1 - Select Your File
In this example, we are going to place the "Sample Excel" file into the Folder/Collection "Sample 1". First things first, select your file.
Step 2 - Drag the File into the Folder/Collection
Drag your selected File into the Folder/Collection that you want to move it to.
Step 3 - Clean Up Your Home Screen
To keep your Home Screen organized, after you have moved the file into the folder/collection, select it, then click the "MORE" menu. Choose "Don't Show In Home". Now the file will be cleanly stored in the folder/collection you designated.