Bookmarks automatically come up when I open Safari

Device or computer? For a computer, what is set in Safari/Preferences/Preferences/New windows open with and New tabs open with?

..Details are in various support articles..

• Browse the web using Safari on iPad - Apple Support

https://support.apple.com/guide/ipad/browse-the-web-ipad999d68f9/ipados

• Table of Contents ^ user guide/iPad

• 10 iPadOS 13 Tips You Should Know for iPad | osxdaily

https://osxdaily.com/2019/10/01/must-know-ipados-tips/

Good luck & happy trails!🌻|🐝

PS: update:

"• 10 Must-Know Tips for iOS 14" | osdaily (Sept 2020)

https://osxdaily.com/2020/09/20/10-must-know-tips-for-ios-14/

Safari across all iOS devices -varies somewhat- from macOS version.

..While still ~ there aren't two separate Safari support Communities..

PS: online user guide ~ tells how to add bookmarks; looks like iPhone iOS/iPadOS:

• Bookmark favorite webpages in Safari on iPad
• (Document Type: Document) Sep 16, 2020 In Safari on iPad, bookmark websites and add them to Favorites to easily revisit later.
• https://support.apple.com/guide/ipad/bookmark-favorite-webpages-ipadc602b75b/14.0/ipados/14.0

• iPad User Guide - for iPadOS

https://support.apple.com/guide/ipad/welcome/14.0/ipados/14.0

Ask Apple: suggest their 'support Communities' show two-versions Safari?

• Feedback - Safari - Apple

https://www.apple.com/feedback/safari.html

Take care & good luck!🌻⛵️