Can I remove other options on Kobo app for my users

Yes, you could do that by configuring the setting of your KoBoCollect android app. Please follow the steps outlined below:

Step 1: Click the settings button as shown in the image below:

Step 2: Then press Admin Settings as shown in the image below:

Step 3: Then press Main Menu Settings as shown in the image below:

Step 4: Now uncheck all the buttons that you wish to keep it away from your enumerators: