I, too, would like to have similar widget options in Instant Apps as I have in Web App Builder. Almost all of my web apps from Web App builder have the share, base maps, and measure widget in them. I just created my first Instant App and was surprised that there was not an option to add a widget.
The instant app that I created is a trail map with images of access points assist dispatch and first responders to locate callers easier on the long trails we have.
I really like the layout of the Attachment Viewer layout for what I'm building because first responders can see what the access points look like while also seeing where they are on the map, but it would be nice to have a couple more quick customization options; particularly commonly used widgets.
Oh yeah, it would also be nice to be able to adjust the size of the image sidebar, although since I'm new to Instant Apps, there may be something I can do to customize that and I just haven't figured it out yet.
I've included a screenshot of my Instant App.
