Question: worksheet mode style

Hi

there are two style to write on the worksheet mode (Text and Math)

I prefer the  writing  on  (text mode ) by pressing (f5) , but my  problem is when I press Enter to pass  to a new line on my page which has (test style). the style of page changes to (math).

my question is How can I fix a style of the worksheet page? 

hi there are two style to write on the worksheet mode (Text and Math)I prefer the  writing  on  (text mode ) by pressing (f5) , but my  problem is when I press Enter to pass  to a new line on my page which has (test style). the style of page changes to (math).my question is How can I fix a style of the worksheet page?hi there are two style to write on the worksheet mode (Text and Math)I prefer the  writing  on  (text mode ) by pressing (f5) , but my  problem is when I press Enter to pass  to a new line on my page which has (test style). the style of page changes to (math).my question is How can I fix a style of the worksheet page?