How to Change the Width of Window Borders
This can be used if you find the default with of the window borders too thin or too wide. These steps will show you how to change it to fit what you are looking to do. If you have a lot of windows open all the time, you may want to shrink the border. If you only like to have one windows open you might want them larger to help with switching to the desktop
Open control panel and click on Appearance and Personalization
Click on Personalization and then Window Color at the bottom
In the Window Color screen, click on Advanced appearance settings
A dialog box will appear where you can change various aspects of the desktop appearance.
In the item box, scroll down to border padding and change the size value the bigger the border size the higher the number. The smaller the border size the lower the number.
Click Ok