Hi! Sorry, I’m not aware of a setting to lower the level of alert that’s raised when an LSP server isn’t found, or suppress it in the way you mentioned.
Just to check, if you’re generally not using the LSP features of Kate, you could disable them entirely via Settings > Configure Kate > Plugins > LSP Client - and if you’re just using Kate as a “notepad”-type application, without its more advanced features, then using KWrite in such cases might be a better fit?
For what it’s worth, the current behavior where that alert is a “Warning” that causes the button to blink, rather than an “Error” that immediately pops up the Output panel, is itself a bit of a compromise since that information might be needed in some cases: step down warning level when LSP not found (!563) · Merge requests · Utilities / Kate · GitLab