CLion Cmake linker error

I have a fairly simple project consisting of 3 files.
Main.cpp - The main executable file
Maze.h - Declaration of a single class (Maze) with it's methods and variables
Maze.cpp - Definitions for the Maze class.

I am using Clion 2025.2

All the files are in the same directory, yet when i press run, i get linker error:

/usr/bin/ld: /tmp/cczGKiNx.o: in function `main':
main.cpp:(.text+0x73): undefined reference to `Maze::Maze(int, int)'

 I have determined that is is indeed a cmake error, because when I compile it manually using g++ it works flawlessly
 

Here's the CMakeLists.txt file:

cmake_minimum_required(VERSION 4.0)
project(Maze)

set(CMAKE_CXX_STANDARD 20)

add_executable(Maze1
        main.cpp
        Maze.cpp
)

And here's the Makefile that works with no problems.

CXX = g++
CXXFLAGS = -std=c++20 -Wall -Wextra -Wpedantic -g
TARGET = Maze1

SRC = main.cpp Maze.cpp
OBJ = $(SRC:.cpp=.o)

all: $(TARGET)

$(TARGET): $(OBJ)
	$(CXX) $(OBJ) -o $(TARGET)

%.o: %.cpp
	$(CXX) $(CXXFLAGS) -c $< -o $@

clean:
	rm -f $(OBJ) $(TARGET)

Could anybody tell me what causes the problem?

Thanks in advance for any help.