Hey
I had the same problem for a while. There was no answer in google so I started editing the code myself and finally found a solution threw trial and error.
To remove the drop-down menu:
Open your code editor for the theme.
Go to: Sections -> collection-template.liquid -> and delete code from line 31 to 118.
It will remove the drop down menu. So far I haven't noticed that deleting this much code messes anything else up.
gl
