change colour / color theme quickly?

Several/many people discussed wanting to change colour theme, such as to dark, but some (myself and those who get tired fast and/or have more than one monitor) also want to quickly such as with always-accessible menu/button/keystroke (classic menus like 'F̲ile E̲dit V̲iew H̲elp' are superior for (re)learning keystrokes... having to open entire settings page then read until you find appearance takes far too long.)  Often I stay up late, then might get tired fast and have to change almost 20 programs on three monitors, and choose a monitor setting, taking a few minutes, which can become quite stressful until over.  Most other chats I use have a visible theme button or a quick settings button containing others so you only have to press once or twice fast.

    It's good you implemented GNU/Linux Discord to use system colours, but the problem is, if you open Discord at day then at night change your system colours to dark, Discord won't update from the new system colours.