In the following image, you can see the menu appears after clicking on the 3-dots button.
I couldn't find any option for seeing previous generated addresses.
Yes. That is how Remitano is. If you click on the deposit history (like bitcoin deposit history), the total number of of deposit transactions will be seen individually, and in each the txid, the date and the amount deposited will be seen. The txid is clickable in which someone will be directed to a blockchain explorer where the address can be seen. I know you know this though, just in case for uchegod-21 to get it right.