I see you are still "shopping" your way through the Arches, my friend? . Good morning from DownUnder.
Is this your ArcoLinux?
What you are asking about is referred to as a "Conky". The plural is arguably conkies or conkys, I will go with Conkys here.
Conkys come in many sizes and shapes and Themes. Some will show as little as a graphical image of the time and date, and then they grow from there to show CPU, RAM, disk space, also processes running ala Top-style.
For Conkys that ship with a Distro, they will likely have their own config file somewhere, this is textual and contents can be tweaked or changed.
On a clean install with the Debian-based Distros, this config file does not exist until conky is installed or launched, and is usually called .conkyrc and is found in your Home folder with Hidden files revealed. For conkys that ship with a Distro, there is usually a toggle switch which will allow the conky to be switched on or off.
Tony George of Timeshift fame produces a product called Conky Manager which is the defacto industry standard for managing multiple conkys, this can be easily installed under Debian-based by adding his Repository via PPA as I have shown in my Timeshift Tutorial at this point
With a few words make a new dir in your home directory : something like ~/.conky
And in there put your theme that you download from web.
And then make a small script with nano or vim (whatever you prefer) which should be something like this
Conky -c ~/.conky
And put it in your path.
Unfortunately in not home and use my phone now . I hope till I will be back home , you will figure it out !