Read this post to find out how to split screen Windows 10 with the best-ever techniques. Note that you have enabled the Snap Windows option first.
1. For the current tab to go Left, hit the Windows Key + Left Arrow Key together.
2. For the current tab to go Right, press Windows Key + Right Arrow Key.
3. For the current tab to go Top, tap on Windows Key + Upwards Arrow/Page Up Key.
4. For the current tab to go Left, click on Windows Key + Downwards Arrow/Page Down Key together.