I was looking for a simple way to connect two laptops and exchange files without the hassle of endless configuration tweaks, and I stumbled across this amazing app from the PowerToys toolset called Mouse Without Borders. It’s free, and it revolutionizes how you interact with multiple machines. You can control up to four computers using a single mouse and keyboard, effectively turning them into one cohesive workspace. Here’s an easy guide to setting up Mouse Without Borders for connecting two laptops.

download Microsoft PowerToys from Microsoft's GitHub page or from the Microsoft Store and install it on both laptops. Make sure that you install the same version on both devices or update PowerToys on the device that has a lower version to be on the same page.

You also need to connect both laptops to the same network or Wi-Fi hotspot. Then, open PowerToys, look for Mouse Without Borders, and enable the feature on both devices.

The only step left to do is to actually connect the laptops. You will see a Security key field. Take the key from one device and press Connect on the other. Now, enter the security key from the other device and type its name; then, click the Connect button again.
https://github.com/microsoft/PowerToys

after you connect two or more (up to 4) devices, you will be able to work with them as they are one device. You will see that you can go with the mouse cursor from one device screen to the other and control both of them with one mouse and keyboard. //

You can simply drag and drop files from one device to the other with your mouse as if it were the same system. The files will be copied into a dedicated Mouse Without Borders folder, and you can use them from there. Moreover, you can share the same clipboard. So, if you copy images or text from one device and press Win + V (to open the clipboard) on the other device, you can simply paste it wherever you want. //

sometimes, it simply disconnects, and you have to refresh the connection. That’s not tragic because the app has a Refresh connections button, and pressing it fixed the problem immediately for me. //

Sea
Ive been testing all options available for windows and windows without borders was the 2nd best I found

I have 2 dual 4k 32in monitors on my desktop and wanted to easily connect my work laptop on 1 screen without a dock.

StarDocks Multiplicity has lots more nice features like KVM, SeamlessDisolay and audio relay. File transfers are a breeze.

You can even setup tailscale for accessing either machine while not on the same network