Maybe try dual screen?

[CanftIn]

I add a old screen with display resolution(1280 * 1024) by HDMI of laptop. The laptop's screen is 1920 * 1080, the layout is that:

Adding the config to i3 file:

exec --no-startup-id xrandr --output HDMI1 --primary --mode 1280x1024 --pos 0x0 --rotate normal --output VIRTUAL1 --off --output eDP1 --mode 1920x1080 --pos 1280x0 --rotate normal

so the vice screen and main screen have their own workspace individually(like that: vice screen at workspace 1 and main screen at workspace 2).
One of my questions is whether i can have the two screens all at one workspace?
Another question is how to let the polybar show on the two screens simultaneously.

That is my screens. Obviously the left screen has no bar.
By the way, the background wallpaper is tiling on two windows rather than tiling on a window one by one. Is any way to fix these?

[CanftIn]

I set nitrogen config file to make wallpaper zoom well. Now just the previous two questions.

[stav121]

Hello sir! Sorry for the (very) late response.

For your first question I suspect that you mean have for example Workspace A to extend from the first monitor to the second. I don't really know if it is possible at all on i3 , and I haven't really encountered a setup like this in the past so I don't know how to help with that :(

For the second question - if you want the same exact polybar (not extend - just duplicate) I think the right way to do this is to copy the configuration for the first bar into a configuration for a second bar (exact same configuration - but set the monitor option to the value of the other monitor) and restart the polybar. This should (normally) cause the bar to duplicate into the second monitor.

I would suggest that you take a look at the polybar wiki (https://github.com/polybar/polybar/wiki/Configuration) , might be more enlightening.