I don't have "Visualize" in "Cell Toolbar"

[bigplayer-ai]

Title: Missing "Visualize" option in "Cell Toolbar"

Description:
I am using nbtutor and I have noticed that the "Visualize" option is missing from the "Cell Toolbar" menu. This makes it difficult for me to use the visualization feature of nbtutor.

Steps to reproduce:

1. Open a Jupyter notebook with nbtutor installed.
2. Click on the "View" menu and select "Cell Toolbar".
3. Observe that the "Visualize" option is not present in the "Cell Toolbar" menu.

Expected behavior:
The "Visualize" option should be present in the "Cell Toolbar" menu, allowing me to use the visualization feature of nbtutor.

Actual behavior:
The "Visualize" option is missing from the "Cell Toolbar" menu.