A working day is a rhythm, not one long stay
Asking your dog to lie still from arrival to home time would fail even a very steady dog, and it is not what settling in an office actually means. What you need is a repeating pattern she can predict: settle on her bed while you work, get up for a toilet break and a stretch, settle again, have a real walk at lunch, then repeat the pattern through the afternoon. Once she trusts that a break always comes, she stops lobbying for one between times, which is where most office pestering comes from.
Set up her place under your desk properly
Put her bed or mat in the most sheltered spot your workspace offers, ideally under or beside your desk where she is out of the main walking route and not face to face with every passing office dog. Bring bedding she already uses at home, a water bowl placed where it will not be kicked, and a rotation of quiet chews. Practise the setup at home first: ask her to settle on that same mat beside a chair while you work at a laptop for short stretches, rewarding her for staying on it when you stand, sit and move papers around.
Build from half days to full days honestly
Start with a morning or an afternoon, not a full day, and pick a day with no big meetings or deadlines. Reward her frequently at first for lying quietly, then space the rewards as she settles into the rhythm, and take the planned breaks even if she seems fine, because a break taken too late teaches her to ask. Add an hour or two at a time across her first few office visits.
Handle meetings, visitors and other office dogs
Decide in advance what she does when you are away from your desk. For short absences a settled dog can stay on her mat if your office allows it and a trusted colleague is nearby, but for meetings it is often fairer to bring her mat, settle her in a corner of the room, or leave her with that colleague using the same cue. Teach a polite greeting rule for colleagues too: people say hello to her on her bed, briefly, and then leave her alone, rather than calling her out for a fuss every time they pass. If another office dog is a particular magnet for her, position her bed with a barrier or your desk between them and reward her for looking at the other dog and then back at you.
Plan the day around her needs, not just your calendar
Look at your diary the evening before an office day and place her breaks where your meetings allow, including a proper midday walk long enough for sniffing and a toilet chance, not a rushed loop of the car park. Have a plan for the day she is unwell, the office is unusually noisy, or building work starts outside the window: a colleague who can take her home or a quieter room can save the training you have built from one overwhelming day.
Share the office routine with the colleagues who help
An office dog is handled by more people than her owner, and mixed messages, one colleague feeding her at their desk, another inviting her to wander, will undo the mat routine quickly. Write down her break times, her settle cue, what she may be given and who is covering when you are in meetings, and keep that plan in KinsLe using Care Teams so everyone who shares your office day supports the same rhythm.