Hi @EmilioRoqueta69 if the gallery all items is blank on load and takes a minuet to load the data you can try this on the second gallery that you wish to hides Visible property:
If(Gallery1.AllItemsCount>0,true,false)
This will count the all items in gallery1 and if it more than 0 it will set this to true if it 0 it will be false.
It would also depend how you are getting your data if your using a collection I would above the Collect() function set a variable
Set(loading,true)
and at the end of the collection I would update this to false:
Set(loading,false)
The in your on visible property have
If(loading,false,true)
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Thanks
Andrew