how to turn toggle sneak on with sodium

You can turn on toggle sneak in Minecraft by changing the sneak setting from Hold to Toggle in the controls/accessibility menu. One guide specifically notes going to Options → Controls/Accessibility and switching Sneak to Toggle so pressing Shift once keeps you sneaking until you press it again.

With Sodium

Sodium itself does not add toggle sneak; it mainly changes graphics/performance. So the usual fix is still in Minecraft’s settings, not inside Sodium’s video options.

If you use a mod

If you mean a separate mod like ToggleSneak, that mod can provide a toggle- sneak keybind and may also set Minecraft’s sneak mode to help it work properly. The mod documentation says the default toggle key can be changed in controls, and if you get stuck sneaking you may need to switch the sneak mode back to Hold.

Fast steps

1. Open Options.
2. Go to Controls or Accessibility.
3. Find Sneak.
4. Change it from Hold to Toggle.
5. Press Shift once to sneak; press it again to stop.

If you want, I can also give the exact steps for Fabric + Sodium or Forge + Sodium.