Configure the option "Show multiple pages side by side" (Tools > Options)

Here you can configure if TextMaker shows multiple pages side by side.

HorizontalPages

0. Off
   

   Registry Hive	HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
   Registry Path	SOFTWARE\Policies\SoftMaker\TextMaker 2016
   Value Name	HorizontalPages
   Value Type	REG_DWORD
   Value	1

1. On
   

   Registry Hive	HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
   Registry Path	SOFTWARE\Policies\SoftMaker\TextMaker 2016
   Value Name	HorizontalPages
   Value Type	REG_DWORD
   Value	32