You can remove an applied quick filter in one of the following ways:
To remove a quick filter applied to a single field:
While displaying a filtered list, click Quick Filter icon in the column header where you applied the filter and choose All from the drop-down list.
To remove quick filters applied to any field:
While displaying a filtered list, in the Condition panel, click .
Besides, you can remove all applied filters from the grid, including quick and advanced ones, at once.