Open the Customize menu, and when this is open you can attack the standard toolbar, mark the one you want and rigthclick, then you can delete it if you want.
But it will now also be possible to adjust the size's of toolbars if you have your pointer over the edge, so maybe that will be a better solution.
V20, V21, 2015/ 16/ 17/ 18/ 19 Pro. Platinum
Deluxe 2015/ 16/ 19
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB