Here are the settings to get the official language server working within Sublime. See MATLAB-language-server.

git clone https://github.com/mathworks/MATLAB-language-server
cd MATLAB-language-server/
npm install && npm run compile && npm run package

Remember the PATH in which you installed this.

Needs MATLAB 2021+.

1. Clone this repo: git clone https://github.com/kurokirasama/matlab_lsp_sublime
2. In sublime text install the LSP package.
3. Open Preferences > Package Settings > LSP > Settings
4. Add the content of the lsp-matlab.sublime-settings file to your clients (copy-paste if you have none).
5. Modify paths accordingly.

MATLAB path should look like /usr/local/MATLAB/R2023a (in linux). Use matlabroot within MATLAB to get its value.

Tested in Ubuntu 20.04, steps my vary in other distributions or OS's.