Open the target website in the same tab

Hello dear forum,

I am currently trying to establish bidirectional communication between a simatic s7 and, for example, the smartphone. That works pretty well.

However, I have a cosmetic problem that I cannot fix.
I have my own webpage. With the I send for example an order to the MQTT broker. That wroks too.
At the same moment the page should switch to the order overview and this is where the problem lies.
I get the page opened in a new tab, but the original tab remains open and in the state of continuous loading.

For forwarding to the page I use an Exec-node which is triggered when I click on a button in the webpage. Here is my experimental flow.

So far, I have not had any success with function nodes and nbrowser-node.
Does someone know about this topic?
Or does someone have another idea how to do that?

Thanks in advance.