Filter the records that are sent from the server to your app users using the data source. For example, to ensure that only records pertaining to the logged-in user are seen, you can filter the records within the data source so that only the records applicable to the logged-in user are sent from the server and visible on your app. Another example: you can choose that only records with priority set to highest priority are sent from the server and visible on your app.
To filter the record source data, open or add any table. See image below.
Then select the Data Source tab and click Add filter Group. See image below.
Next, add any filters to be applied prior to your data being displayed. For example, you can choose to only show records where Priority is Highest. See image below.
You can add as many filters as you wish. You can also choose to only show records that are connected to the specific logged-in user.