The Messages input box should be expandable so that I can see the entire message that I'm composing.
I just tested and did see that the message expands as I typed - in both the browser (Chrome on Windows 10) and in the Android mobile Family Tree app. Are you using the browser or the mobile app when having this issue (What browser/OS)?
For clarity: The box itself is not expandable. But as you type the box/view does expand - so that you can view quite a bit - if not the complete message (the box expands about half the page on Chrome/Windows 10 - on Android the message takes up the extent of the screen - at least on small phone).
@Ronald P. Tilby
I am just another 'lowly' User/Patron ...
Just in passing ...
Question: Are you referring, to 'Messages', in "User Messaging", of 'FamilySearch'?
[ Or, another "Part" of 'FamilySearch' ... ]
And, are you referencing, the (ORIGINAL) Computer version of 'FamilySearch'; or, are you referencing the (NEWER) "Mobile" Application version of 'FamilySearch'?
Using the (ORIGINAL) Computer version of 'FamilySearch' ...
In regards to "Composing", a 'Message', in "User Messaging", of 'FamilySearch' ...
I just "Checked" ...
As, I "Type", the 'Message', the "Text Box" automatically EXPANDED; as, I "Typed", moving onto more lines, as needed.
And, I could "Move", up; and, down, that 'Message', in the "Text Box", using the, "Up"; and, "Down", 'Keys' on my 'Keyboard'; thus, I could 'see' the whole 'Message', that I was "Composing".
I have NOT tried, sending a 'Message', in "User Messaging", of 'FamilySearch', through the (NEWER) "Mobile" Application version of 'FamilySearch',
And, as such, I CANNOT relate to such.
Just my thoughts.
ps: I tired the aforementioned, in the "Browsers" of BOTH, 'Google' "Chrome"; and, 'Mozilla' "FireFox", with the "Operating System" of 'Microsoft' "Windows 10"; and, All with the LATEST versions of each.