Do I need to uninstall the app if I want to disable the widget for a short period of time?

What if I want to "hide" the widget for a while and then show it again after a period of time, do I need to totally uninstall the app?

No. You just have to turn it off or disable within the app's settings and just turn it back on anytime you want. There is no need to uninstall it if you are still planning on using it in the future.

Go to the Widget Settings, flip the Widget enabled switch to the on or off position to enable/disable the widget