You haven't accepted the WGU financial aid offer (which could include both grants and/or loans). It is very common to have multiple schools linked to you FAFSA, as many students apply to various schools and end up taking the most generous offer (meaning the least to borrow). You do not need to remove WGU from your FAFSA (since you haven't agreed to take whatever they offered), but if it will remove any anxiety you might be having I would say go ahead and leave only the school you plan to attend active with the FAFSA. This applies to you removing the financial aid option within the WGU system; remove the selection and you'll remove any anxiety about it being 'active'
Amberton - MSHRB
TESU - ASNSM/BSBA
TESU - ASNSM/BSBA