On Windows 10, starting with the November 2019 Update, version 1909, when you open the Start menu and hover over the left pane will automatically expand to reveal the name of the items in the list.
Although Microsoft has found positive results adding this feature, it’s not something that everyone wants, because it can get in the middle when navigating the menus, and it can make it more difficult to access the power options.
If you don’t like this change, there’s a way to disable this behavior in your installation using a third-party tool called “mach2” from Rafael Rivera.
How to disable mouse over auto expand menu on Start
To disable Start menu expanding the left pane automatically when hovering over with the mouse, use these steps:
Download the latest mach2 zip folder.
Double-click the zip folder.Quick tip: You’ll need to download the zip folder that correspond to your system architecture (x86 or x64), you can check the version of Windows 10 that you’re running on Settings > System > About.
Click the Extract all button from the “Compressed Folder Tools” ribbon.
Click the Extract button.
Copy the path to the folder.
Search for Command Prompt, right-click the top result, and select the Run as administrator option.
Type the following command to navigate to the mach2 folder and press Enter:
In the command remember to change the path to the folder with your path.
Type the following command to disable the auto-expand feature and press Enter:
mach2 disable 18715789
Restart your device.
Once you complete the steps, when opening the Start menu the left pane will no longer automatically expand when hovering over the mouse.
If you want to revert the changes, you can use the same instructions, but on step No. 10, make sure to use this command:
mach2 enable 18715789 and then restart your computer.