Hi @mascaritas,
Unfortunately, the only supported way is to manually select "Show on mobile" for each individual component 
It cannot currently be set via a variable
I realize this is extremely tedious! We have a feature request on file to add a checkbox for showing on mobile by default. It has been quite complex to implement, and, unfortunately, it isn't currently being prioritized. We're continuing to track +1s for this feature in our backlog, and I will let you know if we end up prioritizing it.
There are two known bugs that could cause a component to still not show up on mobile. The first, is that if they are nested inside a container, you need to show the parent container in order to successfully set the child component to also show up on mobile. The second, is that sometimes you will hit an error like "Could not make visible on mobile because component intersects with ComponentName." In that case, you may need to shift around components that are nearby to see if you can resolve the overlapping/intersecting issue.
For visibility, I will mark this as a solution for the time being, but hopefully, we will be able to circle back with a true fix in the future