Whatsapp: Continous loop of messages backup and no text box to type in Samsung S10 Gentlemen,

Two problems I'm facing in WhatsApp in Samsung S10 (fully updated)

1- Whenever I open WhatsApp settings, a message appears "backing up your messages" once it is completed and I try to go back to chats and starts again and again for 3 to 4 times then I can come back. (Backup settings: Never and not able to link it to any google account)

2- In any chat, the text box at the bottom is hidden and I cannot type anything, the only way around is to reply to someone then hold the phone horizontally and then I can type and send.

This is really disappointing especially that I just switched from iOS to barnd new Samsung S10 to find these issues!

(Note: I used a WazzapMigrator to get all my WhatsApp data from my iPhone).
Resetting an application usually solves such random issues.
Long Click on Whatsapp -> App info -> Storage -> Clear Data.
It will reset Whatsapp. Now you will have to use WazzapMigrator again to transfer your data. Hope it helps