Can't Find the Split selected features with selected line from another layer tool

Question

I'm trying to split a selected polygon features with a selected line from another feature layer.

I, however, can't seem to get the tool for this to show up in my advanced digitize toolbar.

In other words, I need someone to tell me how to get my advanced digitizing toolbar to look like this: My current toolbar only contains the first half of these tools.
I need to gain access to the "Split selected feature with select line from another layer" tool and have it show up at the top of my screen.

Answer 1

You didn't specify it in your question but it looks like you are using QGIS.

The "Split selected feature with select line from another layer" tool is from the Digitizing Tools plugin. You may need to download/install from the toolbar menu:

Plugins > Manage and Install Plugins

Once installed and enabled, it should show up in the toolbar. If not then right-click anywhere on the toolbar and you should see the option to enable it:

The icon for the "Split selected feature with select line from another layer" tool is this one:

Answer 2

The Split selected features with selected line from another layer has been removed since the 1.4.0 Version of the digitizing tools plugin (github page of the plugin)
They suggest to use the processing's in-place editing Split with lines instead.