Increasing font sizes is actually buffer-local, I conveniently use it Macs with command-= or command-- with osx layer declared. The function names themselves are spacemacs/scale-up-font and spacemacs/scale-down-font.

The title bar is actually called a breadcrumb. You can disable the feature: https://emacs-lsp.github.io/lsp-mode/tutorials/how-to-turn-off/ I recommend putting it inside the :config section of use-package .

Much appreciated, removing the breadcrumb is a big improvement. spacemacs/scale-up-font and spacemacs/scale-down-font scale all buffers in the frame for me.

@U01HBARPCFL Hmm, if I open A.clj on the first window and B.clj on the second, then calling spacemacs/scale-up-font on the first window only increases the size of the characters in A.clj .

Good to know, perhaps there's a variable I can set to get that behavior. I'll do some investigating