Update to the latest stable release, 2.2.4. This release will be the last in the 2.2 series since LyX 2.3.0 was released on 2018-03-16.
As usual in the latest stable release of each series the most important new feature is the ability to read files in the LyX 2.3.x format. Please note, however, that the conversion process back and forth usually will not leave one with an identical file, so we do not recommend that users of 2.2.4 try to collaborate with users of 2.3.x.
The current release plan is to have this as the last update in LyX for Fedora 26. LyX 2.3.0 is available for Fedora 27+.
sudo dnf upgrade --refresh --advisory=FEDORA-2018-b8f5f0bfb2
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