Hi Robert thanks for posting in the community! There are several settings which impact how you can resize and arrange your shapes which I will detail below. Note that these settings apply to all shapes within a document and not to individual objects. 

First within the Shape Options menu you can alter the height and width of your shape by manually entering your desired values lock the aspect ratio (by clicking the lock icon) and manually enter a shape's X and Y coordinate positions on the canvas. These allow you to very precisely set the size of your shapes and arrange them on the canvas. 

Additionally you can set your document's snapping behavior within Page Settings. If you have enabled Snap to Grid or Snap to Guides Lucidchart will incrementally adjust the size of your shapes when you click and drag to resize them. If you have Snap to Grid enabled you cannot resize a shape so that its width or height would be in between two of the grid squares in the background. For example in the screenshot below the grid is set to 1/8th inch so the shape's size can only be increased or decreased in 1/8th inch increments. Guides are less restrictive as they can be placed where necessary throughout your diagram but would also create that same snapping behavior. 

All objects within your document should be affected by these settings and you should be able to manipulate them in the same ways. If you are having trouble with a certain shape please don't hesitate to share your document URL with our support team here and we'd be glad to take a closer look at what you're experiencing. 

For anyone else with similar questions please review our Page and Document Settings article from the Lucidchart Help Center and post any additional questions below!

Thanks so much Micah that solved my issue. I had not seen the ability to turn off snap to grid option in the page settings. 

Robert thanks for letting me know - glad to hear that helped! Feel free to continue this thread at any time with any other questions.