When sending an email, if you find that only a few lists appear to send to and not the list you need, the first check you should make is on the 'Campaign Summary' screen in your email campaign.
In the 'Campaign Summary' screen, check if there are any lists named under the 'Email Lists' tab. If there are, then this campaign has been restricted to only be allowed to send to these specific lists. To remove this restriction and have the full list of lists appear when trying to send, simply remove all the lists from this section.
If after removing the lists from this section you still cannot send to all lists, or if there were no lists there to remove, please reach out to your CSM or raise a ticket with support.
For more information on the features of the 'Campaign Summary' section, see the below article:
https://support.vutu.re/hc/en-us/articles/360020557597-Campaign-Summary-Screen