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By default, Power Apps can only load 2000 records into a gallery. However, there are some techniques that can be used to load more than 2000 records.
One technique involves creating an index-like ID for the records.
Another technique involves using the ClearCollect function to double the limit to 4000 rows.
Additionally, it is possible to overcome the 2000 record limit by using lazy-load to load records in batches...