I have plot titles in model but try not to use it. A better way is to make a rectang at the required scale using your A1 sheet, the A1 title block is saved in layouts at 1:1 scale then a mview is used to view the model at desired scale. It is a 2 step process make rectangs then make layouts so you can add more as you go along.
This video is step 1, then just select all rectangs which are on a layer and make matching layouts. The code I have takes into account that you may have different orientation, Portrait or Landscape, even down to the rectang can be on an angle and Mview matches.
Ok the sample dwg has been screwed with the 6000 is 4so 1st step is rescale back to match 6000 or 6.0 then make a retang at scale. Put title block in layout at 1:1 ie 841x594 - edges.
Draw rectangs.mp4
I do charge a small fee as the code needs to be setup to match your title block. I am metric ignore scale in movie.
Have a look at this dwg.
Drawing1-2.dwg