Vector Line Width Changed After Saving

[V2ma]

Hello, I am wondering if any one has had this issue. I was working on a drawing in vector format which had various vector line widths. After saving my work and reopening it after several weeks, I noticed that all my line work converted to a single line width. I am fairly certain that I did not select all prior and inadvertently changed my entire file. I was wondering if there is a way to "undo" or go back to what I had originally? Or any advise of how not to do this, lol. It might be user error however I can't figure it out. Your help and input is much appreciated.

[Pšenda]

6 hours ago, V2ma said:

It might be user error however I can't figure it out.

Save file with History, and try find this operation.

Edit: Are the lines grouped in a Group or Layers? Then select this Group/Layer, and set stroke width in Stroke panel. 

Edited August 1, 2023 by Pšenda

[thomaso]

Which app? – There is this option in AD that shows all strokes as thin lines:

[V2ma]

2 hours ago, Pšenda said:

Save file with History, and try find this operation.

Edit: Are the lines grouped in a Group or Layers? Then select this Group/Layer, and set stroke width in Stroke panel. 

Thanks for the "save file with History " tip

[V2ma]

thomaso, thanks for the input. I am using AD. Unfortunately that didn't work however good to know.