
As the picture shows , I cropped a polyline file of the river and drew it inside the layout, but whenever I reopen my project file, or switch to another page and go back to the layout, the river is always not fully displayed (only the part inside the red box is displayed), I can make sure that I cropped the area much larger than my layout paper size. Every time I need to turn off the river layer and then turn on it again, it will show all the rivers in the layout page completely.
I thought it was a GDB problem, but when I put the shp in a normal folder, he still has the problem. I checked my display settings and everything is fine, no limitations due to display ratio or scaling.