Powerapps refresh screen on button click

1. How do I add a refresh button to Power Apps?
2. How do I use OnSelect in Power Apps?
3. What does OnSelect mean in Power Apps?

How do I add a refresh button to Power Apps?

Then click on the Data sources button. You will then see your data sources listed. Click on the ellipsis next to the one you want to select. A small menu pops and all you need to do is to select the 'Refresh' option.

How do I use OnSelect in Power Apps?

While holding down the Alt key, click or tap the background of the gallery or any control in the gallery. All actions will show the Gallery Selected notification at the top of the app. Use the gallery's OnSelect property to specify the default action to take when the user clicks or taps an item in the gallery.

What does OnSelect mean in Power Apps?

OnSelect – Actions to perform when the user taps or clicks a control. Text – Text that appears on a control or that the user types into a control.