Facing the same issue of the 'Notebook' option not being shown under view-->Panes drop-down menu, below is the configuration information that I have on my system. How can I fix this issue? Thanks Much!
* Spyder version: 5.1.4 None
spyder-kernels 2.1.1 py39hcbf5309_0 conda-forge
spyder-line-profiler 0.1.1 py_1 spyder-ide
spyder-notebook 0.1.4 py_0 spyder-ide
spyder-unittest 0.3.1 py_1 conda-forge
* Python version: 3.9.7 64-bit
* Qt version: 5.12.9
* PyQt5 version: 5.12.3
* Operating System: Windows 10