Sharegate allows you to choose the view to use to display items both at the source and at the destination. The view selector is set to "Built-in" by default, which is an artificial view used within Sharegate to return all the items (since a view in SharePoint might have a filter that does not display all the items).
1. To switch from one view to another, click on the drop-down menu located at the top right of the explorer window.
2. The explorer window will automatically be refreshed with the items corresponding to the view you have chosen.