With the release of Xfce 4.16, the MX Linux team now working on migrating the Xfce package base from Xfce 4.14 to Xfce 4.16. The Xfce 4.16 packages are now available for testing for MX-19 series users.

Source: LXer – Install Xfce 4.16 in MX Linux 19.3 Testing Only