The issue with the timeout or login not being sticky has a solution.
On the login options you are offered to use your email for Roku
login or to use a different email, so the solution is to select to
use a different email (even if it is the same as your email for Roku)
and enter or reenter the email associated with your Newsmax Plus
subscription and then enter the password for the Newsmax Plus.
The credentials for Newsmax plus will remain sticky if entered
into the app by this routing. Entering the password in different
places will allow the Newsmax plus app to open but the login
will only stay in effect so long as you are using the app and
the login is not sticky when entered in different places like
Accounts. Other paths for a login are not sticky and the
login will automatically logout or timeout if you switch to
a different channel and try to come back to Newsmax Plus.
But if you use this specific path to enter your credentials for
Newsmax Plus subscription associated email and password
then app will remember your login and not prompt you
every time you leave the app and return to it again.
This is a confirmed SOLUTION for the login not sticky issue.