how to access the buttons when the AR camera is turned on.

I have made a very simple furniture app. I have made use of AR Foundation packages. There are 2 scenes. A menu - in which there is a button named "sofa".

The button then takes you to the second scene where I have used ar session origin with the Ar camera. I have set it such that when I tap on the screen (on the ground plane), there is a sofa model that is generated.

Now i want to change the textures of the sofa through buttons. but the problem is that whenever I tap on the button, in spite of the button executing its function, the sofa gets respawned at the place where I click the button. So basically I cannot access the buttons.