bar and sidebar sizes

Hi. I use ubuntu on a macbook and when i adjust resolution on my mac screen using xrandr -s to scale it down by a 1/2, the sidebar and bar (especially the bar) are the perfect size but because of the size change both the lockscreen and dashboard do not show properly (you can basically only see like the top 1/4). Doing super + shift + r does however fix the lockscreen and dashboard but they make the bottom bar and sidebar very small. If you could guide me to where the dashboard, bar and sidebar size code is i would really appreciate it. Thanks!