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In addition to Monomeeths answer there's another kind of TouchBar configuration that is worth mentioning:

System-native way of configuring elements displayed in Touch Bar for specific application is (or at least should be) provided by application itself.

Usually this configuration is in View menu. This specific screenshot is made for Safari browser, however it works the same way for many other applications:

Yet sometimes applications bury TouchBar configuration a bit deeper inside their own preferences. For example here's where any JetBrains IDE will have this configuration:

In addition to Monomeeths answer there's another kind of Touch Bar configuration that is worth mentioning:

System-native way of configuring elements displayed in Touch Bar for specific application is (or at least should be) provided by application itself.

Usually, but not necessarily, this configuration is in View menu. A rule of thumb is to look for Customise Touch Bar... element in one of status bar menus before you start digging deeper in application preferences. 

This screenshot is made for Safari browser, however it works the same way for many other applications:

Sometimes applications bury Touch Bar configuration a bit deeper inside their own preferences. For example here's where any JetBrains IDE will have it:

In addition to Monomeeths answer there's another kind of TouchBar configuration that is worth mentioning.

System-native way of configuring elements displayed in Touch Bar for specific application is (or at least should be) provided by application itself.

Usually this configuration is in View menu. This specific screenshot is made for Safari browser, however it's the same for many other applications.

Yet sometimes applications bury TouchBar configuration a bit deeper inside their own preferences. For example here's where any JetBrains IDE will have this configuration:

In addition to Monomeeths answer there's another kind of TouchBar configuration that is worth mentioning:

System-native way of configuring elements displayed in Touch Bar for specific application is (or at least should be) provided by application itself.

Usually this configuration is in View menu. This specific screenshot is made for Safari browser, however it works the same way for many other applications:

Yet sometimes applications bury TouchBar configuration a bit deeper inside their own preferences. For example here's where any JetBrains IDE will have this configuration:

In addition to Monomeeths answer there's another kind of TouchBar configuration that is worth mentioning.

System-native way of configuring elements displayed in Touch Bar for specific application is (or at least should be) provided by application itself.

Usually this configuration is in View menu. This specific screenshot is made for Safari browser, but it's the same in other applications.

Some applications bury TouchBar configuration a bit deeper inside their preferences. For example here's where any JetBrains IDE will have this configuration:

In addition to Monomeeths answer there's another kind of TouchBar configuration that is worth mentioning.

System-native way of configuring elements displayed in Touch Bar for specific application is (or at least should be) provided by application itself.

Usually this configuration is in View menu. This specific screenshot is made for Safari browser, however it's the same for many other applications.

Yet sometimes applications bury TouchBar configuration a bit deeper inside their own preferences. For example here's where any JetBrains IDE will have this configuration: