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1.) How to add the Image and text in same line.
2.) How to add the text below the toggle.
here what u can do is keep all images and text(Label widgets) added in 2 D layout and make it visible and and invisible on toggling the button. that would suffice your requirements. please check below links as well.
https://community.ptc.com/t5/Vuforia-Studio/How-to-display-multiple-2D-images/m-p/749727#M10147