The large thumbnails at the top of your drive screen are optional. Some folks love them, and some people find them to be a waste of limited screen space. Whether or not these show on your screen is up to you. This can be turned on and off in the settings for your Google Drive.
To access the settings specific to your Google Drive, click on the gear icon that sits near your profile picture and the waffle.
On the screen that pops up, make sure you have checked off “Make relevant files handy when you need them in Quick Access”. If you do not want the Quick Access Thumbnails, go into your settings and uncheck it.