To deal with better visibility you can split your code in multiples partial classes.
Also, you can deal with region.

Point of start

Let’s deal with the following implementation (MyClass.cs):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace WpfApp.Assets
{
    class MyClass
    {
        internal int param1 { get; set; }
 
        internal int param2 { get; set; }
 
        private void increaseParam1()
        {
            this.param1++;
        }
 
        private void increaseParam2()
        {
            this.param2++;
        }
    }
}

This code is short, but if you add more code, it will be hardest to read it (for example > 10 000 lines !!).

Region

You can use region to hide/show some part of your code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace WpfApp.Assets
{
    class MyClass
    {
        #region "param1"
        internal int param1 { get; set; }        
 
        private void increaseParam1()
        {
            this.param1++;
        }
        #endregion
 
        #region "param2"
        internal int param2 { get; set; }
 
        private void increaseParam2()
        {
            this.param2++;
        }
        #endregion
    }
}

You can split your code in partial classes

MyClass.cs :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace WpfApp.Assets
{
    parial class MyClass
    {
        internal int param1 { get; set; }        
        internal int param2 { get; set; }
    }
}

MyClassMethodParam1.cs :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace WpfApp.Assets
{
    parial class MyClass
    {
        private void increaseParam1()
        {
            this.param1++;
        }
    }
}

MyClassMethodParam2.cs :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace WpfApp.Assets
{
    parial class MyClass
    {
        private void increaseParam2()
        {
            this.param2++;
        }
    }
}

My linux world

cs Partial class / region

Point of start

Region

You can split your code in partial classes