Windows includes a special application desktop toolbar called the taskbar that shows on the bottom of a display screen by default. The taskbar allows you to find, see, open, and switch between your apps. You can also see the date and time, system icons, and items running in the background on the notification area. You can make the taskbar look how you want, manage your calendar, pin your favorite apps to it, move it to where you want to display on your screen, and specify how taskbar buttons group together when you have more than one window open.
If you have the taskbar location at the top or bottom border of your display, you can change the height of the taskbar to what you want.
If you have the taskbar location at the left or right border of your display, you can change the width of the taskbar to what you want.
This tutorial will show you how to change the width or height of the taskbar to the size you want for your account in Windows 10.