Since the release of Foxit PDF Editor v12.x and Foxit PDF Reader v12.x, a new feature for Electronic document signing and management has been implemented, called Foxit eSign, which requires an additional License, and now has its own tab in the Ribbon.
When clicking the Foxit eSign tab, the users are prompted with the following pop-up:
For Foxit PDF Editor:
For Foxit PDF Reader:
This could lead to possible confusion between these two modules.
Often, this module is been mistaken, due to the similar naming with the Fill&Sign module, which is under the Protect tab in Foxit PDF Editor / Foxit PDF Reader, and also on the Home tab.
Please follow the screenshots below, if you wish to use the standard Fill&Sign for Foxit PDF Editor and Foxit PDF Reader, respectively:
For Foxit PDF Editor:
Or: 
If you wish to remove the Foxit eSign button from the Ribbon, as well as the plugin from Foxit PDF Editor after deployment, please run the following batch commands from an Elevated Command Prompt (CMD As an Administrator) below, to all of your users, (or on a single computer, depending on the environment and use case):
Note: This script is specific to Foxit PDF Editor v12.x
Reg.exe add "HKEY_CURRENT_USER\SOFTWARE\Foxit Software\Foxit PDF Editor 12.0\plugins\FoxitSign\Preferences\Sign" /v "DisableFoxitSignService" /t REG_DWORD /d "1" /f
Reg.exe add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Foxit\PDFEditor\Plugins" /v "FoxitSign" /t REG_SZ /d "FoxitSign.fpi" /f
For Foxit PDF Reader:
Or:
If you wish to remove the Foxit eSign button from the Ribbon, as well as the plugin from Foxit PDF Reader v12.x after deployment, please run the following batch commands from an Elevated Command Prompt (CMD As an Administrator) below, to all of your users, (or on a single computer, depending on the environment and use case):
Note: This script is specific to Foxit PDF Reader v12.x
Reg.exe add "HKEY_CURRENT_USER\SOFTWARE\Foxit Software\Foxit PDF Reader 12.0\plugins\FoxitSign\Preferences\Sign" /v "DisableFoxitSignService" /t REG_DWORD /d "1" /f
Reg.exe add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Foxit\PDFReader\Plugins" /v "FoxitSign" /t REG_SZ /d "FoxitSign.fpi" /f
