Step 2: Go to Personalization followed by Themes. Step 1: Press the Windows key + I shortcut to open Settings on your Windows 10 computer. If you are using a third party theme, chances are it will interfere with the color settings responsible for the taskbar. Then select the color from the color palette above. Step 5: In the same setting, scroll down and the ‘Start, taskbar and action center’ option is now available. Select Dark in the ‘Choose your default Windows mode’. If you choose Custom, you will be given two options. Step 4: Now under Choose your color, select Dark or Custom. Step 3: Click on Colors in the left sidebar. You can also use the keyboard shortcut Windows key + I to open Settings. Step 1: Open Settings on your Windows 10 PC using the Start menu icon. Do not worry! Here are the steps in detail.