How do I activate the braces match lines in Adobe DreamWeaver??

Your screenshot looks like it is from VS Code, however you can get visual tabs in Dreamweaver, which is what I think you want? 

You can get the desired effect by either manually editing your code theme's main.less file or by using a brackets extension. Here are both methods:

Firstly, make sure  in edit > preferences > code format that you have insert tabs as spaces UNCHECKED and indent with Tabs selected:

#Method 1 - Edit Your Code Colour Theme in Dreamweaver To Visually Show Tabs

1) First, create your own custom editable theme: go edit > preferences > interface

,2) To create a new theme based on monaki for example, select monaki and then click the add new theme button, give your new theme a name:

3) Now, all you need to do is select your new theme, click the edit button (pencil icon) and add this rule:

.cm-tab {
	border-left: 1px dotted rgba(255,255,255,0.20);
	box-sizing: border-box;
}

4) Change the border color and style as desired to suit your code theme

I think the dreamweaver devs could implement this into the UI and I will make a feature request.

Method #2: Use a Brackets Extension (If You Don't Want To Edit a Code Colour Theme)

1) Download this brackets extension

2) Extract and copy the 'show-tabs-master folder to path something like  this on Windows: C:\Users\USERNAME\AppData\Roaming\Adobe\Dreamweaver 2020t\en_US\Configuration\Brackets\extensions\user\

3) To get the desired color and line style, you will probably need edit the .cm-tab rule in main.css file inside the 'show-tabs-master' folder

This is an alternative Brackets extension here that also works in Dreamweaver but visualises Tabs with horizontal lines instead