Convert a 4 Image Block to a Content Columns Block

Go to Pages, hover over the page to edit and click "Edit"

Click the block above the 4 image block to select it (the new block will be added below this block)

Click the Insert Block button.

Select the "Content Columns" block

In the Content Columns block settings, click "Add Image"

Select the image you want to add.

Click "Select"

Delete the text from the "Heading" field to remove it.

Delete the text in the "Button Text" setting.

If desired, enter the URL you would like a visitor to be taken to but they click the image that was inserted for this column in "Button Link" field.

Click the collapse row button.

Click "Add Column" to insert another column.

Set "Full Width?" to Yes.

In the Spacing dropdown field, select the spacing you'd like above and below the block.

Click on the original 4 Image block to select it and hit the [[delete]] key to delete it.

Click "Update" to save the changes.