Hi @tanvir100500, 

Thanks for your post! When using a mouse, you should be able to zoom in and out by scrolling your wheel and to pan by right-clicking and drag. You can check out those options and set your navigation preferences by following these steps:
 

• If using Lucidchart: Select the View menu from the menu bar at the top of the workspace > Navigation Mode > More info > toggle between the options (Mouse, Trackpad, or Auto) and select your preferred one
• If using Lucidspark: Select the More menu from Board Controls in the upper-left of the workspace > Board Settings > Navigation Mode > More info > toggle between the options (Mouse, Trackpad, or Auto) and select your preferred one.

For more information about the different navigation settings, please take a look a the Community Post below, and follow up on the thread if you have any trouble with this!