This is the 17145th most frequent Russian word.
стартовом
"Стартовом" means "starting" or "launch" in English, depending on the context.
In this sentence, 'стартовом' functions as an adjective describing the 'stage' (этап) being at the beginning or starting point.
На стартовом этапе проекта важно собрать все необходимые ресурсы.
At the initial stage of the project, it is important to gather all necessary resources.
Here, 'стартовом' describes the 'module' (модуле) as the initial or launch-related component of the rocket.
Мы установили новый двигатель на стартовом модуле ракеты.
We installed a new engine on the rocket's starting module.
'Стартовом' here modifies 'screen' (экране) to indicate its purpose related to the startup phase of the application.