Hi there,
1. You should identify the elements that are too close together and separate them a bit (likely with CSS).
2. Identify the text that is too small and increase the size. This can be done in the Customizer if possible. If not, you can use CSS.
3. If your content is wider than your screen, it means something in your content is creating a horizontal scrollbar. You can see if it exists on other pages with no content to make sure it is actually the content doing it.