In TraditionalForm output, I would like to have Conjugate be always displayed as an overbar, not an asterisk superscript. In particular for complicated expressions like `Conjugate[Log[z]]`, I would like to have a long overbar. There are various solutions proposed in other threads, including the simplest version: Unprotect[Conjugate]; Format[Conjugate[x_], TraditionalForm] := OverBar@Pane@x; Protect[Conjugate]; This gives the desired result, but *only the first time* I call `// TraditionalForm` on some output. **How can I ensure that this new format rule is applied throughout the rest of my notebook?** PS: As requested here a full MWE with Mathematica 13.0.1.0. Quit[]; Unprotect[Conjugate]; Format[Conjugate[x_], TraditionalForm] := OverBar@Pane@x; Protect[Conjugate]; Conjugate[Log[z]] // TraditionalForm Conjugate[Log[z]] // TraditionalForm I obtain the output > $\overline{\log z}$ > > $(\log z)^*$