Hi. I found a mistake in menuconf.tab setting. (´・ω・`)
Shortcut key "/" is assigned to different functions.
(https://i.imgur.com/VFv4sfP.png)
https://github.com/jamespetts/simutrans-pak128.britain/blob/master/config/menuconf.tab
simple_tool[20]=,/
toolbar[11][10]=dialog_tool[21],,/
Thank you for that: I have now remedied this by assigning simple tool 20 to the ' key.