It is based on published documentation, not hands-on testing.
A keyboard can sit neatly in front of you while the mouse remains too far to the side. CCOHS notes that extra keyboard keys, including a number pad, can keep the mouse from lining up comfortably with the arm and shoulder. Before changing devices, watch where your hand actually travels during a pointing task. [1]
Observe a mouse task on its own
Use an ordinary task such as selecting text or moving between controls. Notice whether your upper arm reaches outward, your body leans, or the mouse gradually drifts farther away. Then repeat at the desk's other working height. This comparison is an observation exercise, not an injury test.
CCOHS says there is no single right or wrong mouse location. The workstation must be assessed so that using both keyboard and mouse does not require excessive reaching or leaning. A photograph of a tidy desk cannot substitute for observing the task. [1]
Make the available space visible
Temporarily move objects that occupy the easy-to-reach area. Check whether the keyboard's width, a tray edge, or the desk shape prevents a better mouse position. Write down the actual constraint before deciding that the mouse itself is the problem.
CCOHS describes shorter keyboards and mouse platforms as ways to create space in some setups. These are options with tradeoffs, not instructions that everyone needs to buy an accessory. A number pad may still matter to your work, and a space-saving change must leave your typing task usable. [1]
A tray when the work surface is the constraint
VIVO MOUNT-KB05E — black, 27 × 11-inch tray
The VIVO MOUNT-KB05E is an option when objects or the desk edge prevent you from keeping the keyboard and mouse together in an easy-to-reach area. Its shared tray gives you a defined surface to compare with your measured keyboard-and-mouse footprint.
It does not make a wide keyboard narrower. If the number pad is the cause of sideways reach, this tray alone may not help. Check the usable tray area, clamp clearance, underside obstructions and resulting input height before buying; keep the mouse and keyboard workable in both desk positions.
Check Price on AmazonDo not solve reach by creating a height mismatch
A platform may reduce sideways and forward reach, but CCOHS notes that it can put the mouse above keyboard level and leave the hand in a less natural position. Evaluate height along with location instead of judging only whether the mouse moved closer. [1]
If an existing platform or tray adjusts, check its normal operating instructions before changing it. Compare the new arrangement while seated and standing. Do not assume a single accessory setting will work with every desk height or arm support.
Check whether the improvement lasts
CCOHS notes that a defined platform area can limit the tendency to move the mouse farther away during work. Even without changing hardware, observe where the mouse ends up after an ordinary task rather than only where you initially placed it. [1]
A short record can separate a space problem from a habit or a mechanical obstruction. Note the working height, starting position, ending position, and any cable or object that interfered. Change one thing at a time so you can identify what helped.
Keep both input tasks in the result
- Mouse reachable without leaning?
- Keyboard still centered for the actual typing task?
- Mouse and support heights workable together?
- Same arrangement usable at both desk positions?
Persistent discomfort needs appropriate assessment. This check helps you describe the workstation constraint; it does not diagnose symptoms or guarantee that a particular layout prevents injury.