Can’t tap “send” when too many people in the list

In iOS if I have over 40 people in my group. If I choose the “unlimited” option to send all sms in a single message then when I write the message and then tap to send, it opens the messages window, but the list is so long the message is off the bottom of the screen so I can’t tap “send”.

The workaround I use is to limit it to batches of 20. This works but would be great if the unlimited option worked.