Disk Utility on macOS Catalina 10.15.7 does not let you shrink or extend the Bootcamp Windows partition. There are lots of third party software around, but most of them did not support Catalina OS the time of writing (April 2021). I found a working software: Paragon Hard Disk Manager. Boot Camp Assistant prepares your Mac by creating a new partition for Windows named BOOTCAMP and downloading the Boot Camp support software. Important: If you’re using a Mac notebook computer, connect it to a power source before continuing. 2 points 1 year ago. Even High sierra won't install windows 7 in boot camp anymore. Resize your partition, backup your catalina boot drive, downgrade to Sierra or lower if you can, install windows 7 with bootcamp assistant, then restore your boot drive to catalina. I have windows 7 running with boot camp and would like to upgrade to Catalina but only if it will not cause any loss to my windows partition. I haven’t had any issues with any other upgrades but I want to make sure before I go forward since I have so much going on right now with my windows side that I don’t want to have to save it all just to install it all onto another computer.
MacOS 10.15 Catalina was released on October 7, 2019. Updates included enhanced voice control, and bundled apps for music, video, and podcasts that together replace the functions of iTunes, and the ability to use an iPad as an external monitor. Catalina officially dropped support for 32-bit applications. MacOS 11 Big Sur. Winter Research Computing Bootcamp starts February 2. January 20, 2021. Get to Know Google Meet. December 16, 2020. Year End Round-Up With UAlberta Google.
Boot Camp Control Panel User Guide

In Windows on an Intel-based Mac, you can set trackpad options that affect clicking, secondary clicking, dragging, and more. Depending on your trackpad, you see only some of these configuration options.
Bootcamp Catalina External Drive


In Windows on your Mac, click in the right side of the taskbar, click the Boot Camp icon , then choose Boot Camp Control Panel.
If a User Account Control dialog appears, click Yes.
Click Trackpad.
In the One Finger section, select any of the following:
Tap to Click: Lets you tap the trackpad to click.
Dragging: Lets you move an item by tapping it, then immediately placing your finger on the trackpad and moving your finger.
Drag Lock: Lets you tap the trackpad to release an item after dragging it.
Secondary Click: Lets you perform a secondary click by placing one finger in a corner of the trackpad and clicking. Choose the corner you want from the pop-up menu.
In the Two Fingers section, select Secondary Click to be able to perform a secondary click by placing two fingers on the trackpad, then clicking.
Bootcamp Catalina Fusion Drive
Boot Camp Assistant User Guide

You can use Boot Camp Assistant to install Windows 10 on your Intel-based Mac.
Install Windows on your Mac

Depending on the model of your Mac, you might need an external USB drive to install Windows (you’re asked for one when you prepare your Mac for Windows if it’s required). Newer Mac models—with OS X 10.11 or later—use the internal drive to temporarily store the items you need to install Windows and don’t require a USB drive. To find out whether you need an external USB drive, see the “Learn more” section in the Apple Support article Install Windows 10 on your Mac with Boot Camp Assistant.
To install Windows on your Mac, do one of the following:
If your Mac doesn’t require an external USB drive: Follow the instructions in Install Windows on your newer Mac using Boot Camp.
If your Mac requires an external USB drive: Follow the instructions in Install Windows on your older Mac using Boot Camp.
Set the default operating system
Instalar Windows 7 Bootcamp Catalina
After installing Windows, you can set the default operating system to either macOS or Windows. The default operating system is the one you want to use when you turn on or restart your Mac.
In macOS, choose Apple menu > System Preferences, then click Startup Disk.
Click the lock , type an administrator name and password, then click Unlock.
Select the startup disk that has the default operating system you want to use.
If you want to start up using the default operating system now, click Restart.
The next time you turn on or restart your Mac, it starts up using the default operating system.