It’s tricky to make it work properly but it’s possible.
Here some useful ideas:
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Search by multiple characteristics Creating Custom Searches and Search Bars in Adalo - YouTube
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Set a filter back to empty [SOLUTION] How to allow user to delete image from a record
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It is not necessary to create a relationship between databases to make it work, it is enough to set a filter that only shows lessons if its price is equal to Logged in user > price filter