Installed the new mac software and it is screwed now?

surfbugbob wrote:

Can I increase the mouse percentage to see a larger one?

If you want a larger percentage, you will have to charge the mouse.

Presuming that you have a Magic Mouse 2, charge your mouse following the instructions located in Charge a Magic Keyboard, Magic Mouse 2, or Magic Trackpad 2 with Mac.

If you don't have a Magic Mouse 2, refer to Change Magic Mouse batteries.

That interface changed in macOS Ventura. "System Preferences" was changed to "System Settings" as described in Customize your Mac with System Settings.

Click on System Settings in the Dock or under the Apple Menu. It will open with appearance highlighted and the mouse should be in the left-hand pane. Click on the mouse and the battery percentage should be at the top of the right pane under Mouse. See below:

surfbugbob wrote:

how do I check wireless mouse now before I saw the percentage of the battery on the mouse?

As displayed in your screen shot, and indicated by the red arrow in my screenshot, below the "percentage of the battery" appears in a different location.

Bob, If you mean to make the actual mouse cursor larger, here is the link on the Apple Web site:

Make the pointer easier to see on Mac - Apple Support

You can also just click the bluetooth icon in the top bar. It should show the battery percentage of the mouse and keyboard.

Settings>Accessibility>Vision>Display

The percentage listed under Mouse is the state of charge of the battery of the mouse.