After you click Sent to LayOut, you should be presented with a window that asks you to choose a template. Like this:
If you want to use your own template, click on My Templates. It will display the templates you have saved for LO2019.
Select the template you want for the project and it should open with the viewport from the SketchUp model displayed.
Since it sounds like you selected one of the supplied templates instead of your own, you can either start over or you can open another LO project with File>New and choose your template for that one. Then copy what you’ve already done on the wrong template and paste it into the correct one.