User blog comment:ヌヌハラ/alice-tools v0.2.0/@comment-45214281-20200313112813/@comment-45214281-20200316072256

Ok so I think I traced it back to the preconfigured font size. In the dictionary like structure in the game .ex file, there is a key "Ｅ＿メッセージウィンドウ.%D番.メッセージテキスト.フォントサイズ" (where %D can be a number between 1 and 4).

Out of the 4 configs, one is for narrating messages and one is for dialog messages. I have not find about the 2 others yet, but it is not needed for now.

Anyway, this appears to be working. Modified values in the ex file are effective in game.

It seems to affect the font size for a new game but for a save the old size is still used. It must be linked to the save file somehow.