Thank you for the reply.  I found the pronlem. When I start to draw rectangular I held the mouse 🐁  button 🔘 and drew  the line which provides a background of pink. 

Then I tried doing it only by clicking the button 🔘 on the section and leave button 🔘 then draw box and it works.  My apologies and thank you very much zkicad is v7. 0.8