lsp-ui
                                
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                        lsp doc overlay imenu when open lsp-ui-imenu
when open lsp-ui-imenu, lsp doc will overlay the imenu.
Could you perhaps provide a screenshot and some more detail into how one could replicate the issue?
step to replicate the issue
- open a project using ccls
- open a file
- open lsp-ui-imenu
- move cursor to a variable who has doc
Then you will get a result like the following

Sorry to ping the thread, but I think this is a non-issue - it is a simple matter of configuration:
(setq lsp-ui-doc-alignment 'window) will limit the doc to the selected window (ie. will not 'invade' other windows).