In the TOP RIGHT hand corner of your drive, beside the i, you will see either an icon that looks like a four bullet points and lines (if your are in Grid View) or an icon that looks like 8 squares (if you are in List view).
This is where you can switch between the two different views.
In GRID VIEW, you see each of your files as a small square that gives a quick look (preview) of what it looks like.
This can make it easier to open the file you want.
In LIST VIEW, underneath the suggested files (these are like the 'continue watching' shows in Netflix, the files you have been working on most recently), you will see all of your folders and then your files as a list.