In theory, it is possible to find it via a Start menu search, but I never remember the exact words to find it (or if I do they don’t seem to work until after I’ve found the settings via the Settings app.
A few weeks ago, I did a post on using the ms-settings URIs as shortcuts to quickly access the settings.
To quickly get to the relevant settings for choosing which icons show in the system tray, hit Win+R and type
When the Settings app opens, on the Taskbar page, scroll down and, under the Notification area heading, click Select which icons appear on the taskbar (ringed in red):
All of the apps which can display in the system tray should be listed and can be enabled, or disabled, to always show by clicking the toggle: