every time i open safari there are tabs at bottom of screen

i’m not a fan of the “Shelf” feature either. We need a way to turn off / disable that feature.

From your screenshot, I suspect that you make reference to the “Shelf” - this being a new feature of the now revised iPadOS multitasking environment. 

iPadOS permits you to have multiple “instances” of the same App - each instance being self contained. The shelf, as illustrated, shows a thumbnail of each running instance of an App. 

For example, if you have three running instances of Safari, each with its own set of open tabs, you will see three thumbnails corresponding to each running instance of Safari - plus a button to open a new instance of Safari. Simply tapping a thumbnail will switch directly to that running instance of Safari. Each App has its own corresponding shelf.

This article from Appleinsider has a useful explanation of this new feature along with many of the updates to multitasking:

https://appleinsider.com/articles/21/08/12/how-to-master-multitasking-on-ipad-and-ipad-pro-in-ipados-15

The iPad User Guide is also a rich source of frequently overlooked information. The Guide is available both online using a web browser (such as Safari), or as an Apple Books download:

iPad User Guide - Apple Support

https://books.apple.com/book/id1567104892

You should note that the shelf is an integral component of the multitasking User Interface. It cannot be disabled.

Open a new page in the Safari web browser on your iPad mini. Scroll down and tap the Edit button. In the resulting pop up control menu, turn off the Frequently Visited option and close that control pop up.

Apple provides a method for you to leave constructive suggestions, feature requests, and other non-rant comments at https://www.apple.com/feedback/