On the project level the main panel buttons are always displayed towards the top right, no matter the project page.

This is what the panel icons towards the top right can look like:
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On devices with limited screen space a button called view is displayed instead.

Click on view to show switch between the different panels.
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In this article information about the following topics can be found:

Panels can be opened in different ways.

By default, when a project is opened from the projects page the content page is opened and the dashboard page is displayed.

There are several situations where the model viewer/3D panel automaticaly gets opened.

Devices with larger screens

When a panel is open it is highlighted in green.

Select a panel that is not active yet to open it side-by-side with the other active panels.

Selct an active panel to disable it.

There has to at least be one panel active at once.
As an exampe, to switch from the content panel to the 3D panel, enable the 3D panel along with the content panel first and then disable the content panel to only have the 3D panel active.
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To easily switch between the different panels keybinds can be used.

Shift+1 for the main content panel

Shift+2 for the model viewer panel

Shift+3 for the model tree panel

Shift+4 for the model information panel

Devices with limited screen space

The open panel has a gray background.

Select another panel to switch to that panel.

With limited screen space it is only possible to have one panel open at a time.

The main content panel is the first panel and has the most information.

Some users strictly work in the content panel.

This panel is also referred to as the content panel.

The content panel can contain the following main pages:

Dashboard

Models

Topics

Documents

Libraries

Reports

Notifications

Settings

Click here to read more about the content panel.

The Model viewer panel is the second panel.

This panel is also referred to as the 3D viewer panel.

The model viewer panel can contain the following main pages:

3D viewer tools

2D viewer

Click here to read more about the 3D panel.

The model tree panel is the third panel.

This panel is also referd to as the trees panel.

The trees panel can contain the following main pages:

Containment tree

Component tree

Type tree

Layer tree

System tree

Click here to read more about the trees panel.

The model info panel is the fourth and last panel.

This panel is also referred to as the inspect panel.

The In panel can contain the following main pages:

Inspect

QTO (Quantity Take-Off)

4D

Selection

Measure

Click here to read more about the content panel.