By default Ticketmeo only collects Name, Email and Country during checkout. You are not able to remove these options. You can however gather additional data from each customer.
Additional fields are split into 2 sections.
Buyer questions - Only asked once per order. EG. Mobile number, custom TOS for the buyer to agree with.
Attendee Questions - Questions that are asked for every ticket purchased/reserved. EG. Lunch preference, T-Shirt size, Allergies etc.
Additonal questions are set per event, to modify this select your event then go to Customise > Checkout Forms.