Only Debug configuration appears

How can I create a build configuration for release build (with optimizations, etc.)
The project is imported from existing sources, with a custom CMakeLists.txt file.

In the Edit Configurations window, only "Debug" appears as configuration, with no way to add another configuration.




The CMakeLists file:

 cmake_minimum_required(VERSION 3.6)
 project(epi CXX)
 
 set(CMAKE_CXX_STANDARD 14)
 
 find_package(OpenCV REQUIRED)
 
 include_directories(SYSTEM external/include)
 add_compile_options(-Wall -Wextra -Wno-sign-compare)
 
 file(GLOB_RECURSE EPI_SRC "src/*")
 add_executable(epi ${EPI_SRC})
 target_link_libraries(epi ${OpenCV_LIBS})