Can you please provide more details?
I want to remove buttons and text
only i want to keep Launch in web button
If you remove those 2 buttons that page will not serve much purpose. Maybe you want to launch automatically?
If you want to automatically launch the meeting, read this reply/post: Jitsi meet FORCE me to use Always the App in Apple or Android
To change the appearance of this page or hide buttons, you can follow up the technique mentioned in this post: Change Text on Initial Page (Home) (though I have not modified this landing page specifically, I expect the process is the same)
Finally, if you just want a landing page before the user joins the meeting, consider the prejoin page: [How to] How do I use the prejoin page?