How do I increase the number of items on a jump list in Windows 10?

The fix: (guide with screenshots)

1. Click "Windows key"
2. Type/run regedit
3. Find folder: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced
4. Right click folder Advanced
5. From the Edit menu, Select New > DWORD (32-bit) Value
6. Rename new key to: JumpListItems_Maximum
7. Right click and select Modify...
8. Change value to desired value (e.g. 15 or 20) and select Decimal
9. Click OK button to save

Further notes

When I did above, no restart was required. Some claims you need to reboot to ensure it's working, but never experienced a reboot was required.

I personally prefer 19 as value (my FullHD screen will add scroll for higher number). Default value is 10.

Edit: Added link to guide with screenshots