The "bitmap size" is an erroneous message arising from the very tall page you created.
Rebuilding into Layer should make it alright.

The excessive Text Column you used affects a lot of other screen rendering in the design and slows everything down.

Here is how I would recover your design. Feel free to follow your very first aphorism.

  • In the Text Tool copy out all your sayings into a text editor, MS's Notepad is good enough for this.
  • Delete this Text Column.
  • Reduce the page height to 1600px.
  • Set Main's width to 1080px.
  • Try and reduce the wasted height of the image and NavBar by combining.
  • Definitely set up Guides and Lock the Layer.
  • Enable Snap to Guides.
  • In the Page & Layer gallery, double-click on the page icon to show the current Layers.
  • Create a new Layer for each of the current Anchors in your sub-NavBar.
  • Create Paragraph Styles for the Site Logo - H1, the Sayings Headings - H2, and the sub-navBar Links - H3.
  • Set up all new texts as Text Areas 720px wide on each new Layer at the same vertical position - use a Horizontal Guide.
  • Copy back in the text for a given Layer.
  • Make its title H2.
  • Link from its Link to the Layer with Link > Pop-up layer instead of Link to anchor.

My example design covers your first six headings: Words of Wisdom.web

Acorn