There are multiple wars to delete a row.

You can retrieve every row you deleted from the Trash Bin of the table. 

Right click

Right click on the row you want to delete and choose the option Delete row(s) :

To delete multiple rows at once, simply select as many rows as you want to delete and apply the same process as previously explained :

From the record 

Open the record and click on the icon  at the bottom left corner of the record :