@Aurora2017SRL This extension [actually a plugin] is well over a decade old ! It's also encrypted in the old RBS format. It's unlikely to get updated. Luckily the toolbar's code is in the editable RB file... Find the file in Plugins, it's named Helix-along-curve-tool-0.9.rb Edit it with a plain text editor [Notepad++ or on MAC bbedit || wrangler ?] Find the line helixD_bar.show and edit it, adding extra text to read helixD_bar.show if helixD_bar.get_last_state.abs == 1 # TB_VISIBLE/NEVER Save the changes and restart SketchUp. Now the toolbar's status will be remembered across sessions - i.e. either visible or off