Firstly, kernel 6.11 has reached EOL. You must replace it with a supported kernel; perhaps 6.12 (the current LTS) with 6.6 (LTS) as a failsafe.
- Manjaro Kernels (Manjaro Wiki)
As others have indicated, required network software is not installed and network shares are not activated by default in Manjaro; whatever your problem may be, you are likely ‘barking up the wrong tree’, as the saying goes.
As a:
you will be aware that Windows was famous for just the scenario you describe. However, Manjaro does not allow this to occur by default; it is not generally possible without User interaction. This means that you, or someone having access you your computer, must have setup file sharing; whether inadvertently or knowingly.
Please think before making unsubstantiated claims, and remember that Linux is not Windows.
Even with Samba manually installed and properly configured, other computers on the LAN can only see folder hierarchies that you have explicitly shared. That being the case, to prevent sharing a hierarchy on your LAN, you should disable the share you created; or disable file sharing completely.
While I appreciate your background may likely be Windows-oriented, and by extension, Linux is new to you, perhaps some of the following article(s) may be worth looking at with a view to reversing whatever steps were taken.
- Samba (Arch Wiki)
- Basic Samba Setup and Troubleshooting (Manjaro Tutorials)
- Using Samba in your File Manager (Manjaro Wiki)
Regards.