Regarding elixir-ts-mode in particular, as noted in https://debbugs.gnu.org/67246, its highlighting is currently being reworked.
Also try C-x p g for a similar UI.
C-x p g
Customize xref-search-program to make it use ripgrep under the covers.
xref-search-program
Regarding elixir-ts-mode in particular, as noted in https://debbugs.gnu.org/67246, its highlighting is currently being reworked.