Changing the notehead set of the 1st of tied notes

I learned now to make noteheads larger through notehead sets. I use the larger heads to indicate the melody. I now have the situation where one melody note is sustained under another.

How might I enlarge the first head of a tied note and not the second?

In this example the downstem note before the barline and the upstem note after the barline are the melody. The upstem head has already been made larger, the downstem head hasn’t yet, because the downstem head after the barline would also be made larger.
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You can change the notehead design and/or scale size of individual noteheads in tie chains from Engrave mode.

Thanks for your solution, Lillie _Harris - but in Engrave mode I have been able to change the notehead of an individual note in a tie change via right-click on that note, but I cannot seem to figure out how to scale the size of an individual note in a tie chain in Engrave mode. Could you elaborate? Thanks.