It is possible to start Helix with a different theme without modifying the existing config.
- Copy the original config.
cp ~/.config/helix/config.toml ~/.config/helix/config-copy.toml
- Modify the new config.
theme = "another_theme"
- Run Helix with the
-c
flag.hx -c ~/.config/helix/config-copy.toml
Optional: