thats not how it works in vngine , rightclick goes dialogue backwards. You have to esc and save or press the save button from the quick menu on the right of the dialogue panel.If your playing on the computer right click on the mouse and then once the save screen comes up click on a empty box to save the game. If you don't want multiple saves then just click on a box that already has a save on it and click on yes to save over that save file
There is/was a bug in chapter one that could block the esc key menu if you hit N i think, because it used to be a house navigation map that i since removed ,but some old legacy ghosts i think caused this bug to happen. We found that out way later and it wasnt possible to patch anymore. Will be solved for the steam version tho