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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1814 below:

CA1814: Prefer jagged arrays over multidimensional (code analysis) - .NET

A member is declared as a multidimensional array, which can result in wasted space for some data sets.

In a multidimensional array, each element in each dimension has the same, fixed size as the other elements in that dimension. In a jagged array, which is an array of arrays, each inner array can be of a different size. By only using the space that's needed for a given array, no space is wasted. This rule, CA1814, recommends switching to a jagged array to conserve memory.

To fix a violation of this rule, change the multidimensional array to a jagged array.

It's okay to suppress a warning from this rule if the multidimensional array does not waste space.

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA1814
// The code that's violating the rule is on this line.
#pragma warning restore CA1814

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.CA1814.severity = none

For more information, see How to suppress code analysis warnings.

The following example shows declarations for jagged and multidimensional arrays.

Imports System

Public Class ArrayHolder
    Private jaggedArray As Integer()() =  {New Integer() {1, 2, 3, 4}, _
                                           New Integer() {5, 6, 7}, _
                                           New Integer() {8}, _
                                           New Integer() {9}}
    
    Private multiDimArray As Integer(,) =  {{1, 2, 3, 4}, _
                                            {5, 6, 7, 0}, _
                                            {8, 0, 0, 0}, _
                                            {9, 0, 0, 0}}
End Class

public class ArrayHolder
{
    int[][] jaggedArray = { new int[] {1,2,3,4},
                            new int[] {5,6,7},
                            new int[] {8},
                            new int[] {9}
                          };

    int[,] multiDimArray = {{1,2,3,4},
                             {5,6,7,0},
                             {8,0,0,0},
                             {9,0,0,0}
                            };
}

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