Go to Settings menu under Omni Sales module from the left sidebar -> Select the Default setting

Bill header and bill footer for POS channel

• Enter the bill header and Bill foooter and click Save button 
  It will appear after the order on POS is successfully created
  
  

Show products by department (POS)

• If "Show products by department (POS)" is checked: Products are displayed according to the department of the employee who is logged in. So, conditions for products to be displayed on employee POS channels include: + Employees must belong to at least 1 department + Show only products with available stock (uncheck "Do not update inventory quantity) and products as services (check "Do not update inventory quantity") + adding items to the pos channel must select the applicable department. If no department is selected, this product will not be displayed on any employee's POS channel.
• If "Show products by department (POS)" is not checked: Regardless of which product is applied to any department, it is displayed on the POS channel of all system employees. Show only products with available stock (uncheck "Do not update inventory quantity) and products as services (check "Do not update inventory quantity")

Show Portal

• If Show Portal is checked: Show store and cart and Order list menu in customer portal
  
  And you have to enable Display Shopping cart and Products on Client portal option in Order setting
  
  
• If Show Portal is not checked: Don't show store and cart in customer portal.