Hi John
First you have to go to your main bank account settings by clicking on the pencil icon next to your bank balance. This takes you into the settings where you will find a field which says cheques payable to with your company name showing in the box. Delete your company name from that field. Save the changes.
Next head to Settings>Invoice themes>all and identify the Invoice theme that is your default theme. Click Edit button of that theme and on the Invoice Payment advice box, remove all reference to cheque payment. Save the theme by clicking on the button at the bottom of the page.
Click preview of the theme to make sure you can see the changes and reference to cheques do not show any more on the Invoice.
Best regards
Latha